Please assess the completion status of the following clinical trial:

Trial Title: An Efficacy and Safety Study of Atabecestat in Participants Who Are Asymptomatic at Risk for Developing Alzheimer's Dementia

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE2/PHASE3
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Participant must have a global Clinical Dementia Rating Scale- (CDR) score of '0' at Screening~* Participants 60 to 64 years of age must also have 1 of the following 3 conditions: a) a positive family history for dementia (minimum of 1 first degree relative), b) a previously known apolipoprotein E, ε4 allele (APOE ɛ4) genotype, c) a previously known biomarker status demonstrating elevated amyloid accumulation in cerebrospinal fluid (CSF) or positron emission tomography (PET)~* Participant must be able to read and write and must have adequate hearing and visual acuity to complete the psychometric tests. The legally acceptable representative must also be able to read and write~* Participants must have evidence of amyloid accumulation by means of either: a) low Cerebrospinal Fluid (CSF) ABeta 1-42 levels at Screening; b) a positive amyloid positron emission tomography (PET) scan at Screening (depending on the site's PET capability) by visual read~* Participant must be otherwise healthy for their age group or medically stable with or without medication on the basis of physical examination, medical history, vital signs, and 12-lead electrocardiogram (ECG) performed at Screening or at Baseline~Exclusion Criteria:~* Participant is receiving an acetylcholinesterase (AChE) inhibitor and/or memantine at any time during Screening or Day 1 predose~* Participant has evidence of any brain diseases, other than potential very early signs of Alzheimer's Dementia (AD) (example. mild hippocampal atrophy) or typical age-related changes (e.g. mild white matter hyperintensity on magnetic resonance imaging \[MRI\]) or any other abnormality (e.g. folic acid/Vitamin B12 deficiency) that could explain a possible cognitive deficit (including, but not limited to vascular encephalopathy or large strokes (as imaged by cerebral MRI)~* Participant has any contraindications for MRI (example, prostheses, implants, claustrophobia, pacemaker)~* Participant has met criteria for dementia or has a brain disorder that can cause dementia~* Participant has evidence of familial autosomal dominant AD (mutation identified in the family and/or participant prior to randomization)

- Gender: ALL
- Minimum Age: 60 Years
- Maximum Age: 85 Years
- Healthy Volunteers: t

Study Arms:
- Group 1 (Type: EXPERIMENTAL): Participants will receive one atabecestat, 5 milligram (mg) tablet orally once daily up to 54 months.
- Group 2 (Type: EXPERIMENTAL): Participants will receive one atabecestat, 25 mg tablet orally once daily up to 54 months.
- Group 3 (Type: EXPERIMENTAL): Participants will receive one matching placebo tablet orally once daily up to 54 months.

Based on this trial design, predict the completion outcome and termination type (if applicable).