Please assess the completion status of the following clinical trial:

Trial Title: To Evaluate the Immunogenicity and Safety of Sequential Immunization Schedules of Sabin IPV and bOPV

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: SINGLE
- Phase: PHASE4
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* subjects aged from 60 days to 89 days old at the date of recruitment;~* with informed consent signed by parent(s) or guardians;~* parent(s) or guardians are able to attend all planned clinical appointments and obey and follow all study instructions;~* subjects did not receive any vaccination within 14 days;~* axillary temperature ≤37.0℃~Exclusion Criteria:~* allergic to any ingredient of vaccine or with allergy history to any vaccine;~* acute febrile disease or infectious disease;~* serious chronic diseases;~* any other factor that makes the investigator determines the subject is unsuitable for this study;

- Gender: ALL
- Minimum Age: 60 Days
- Maximum Age: 89 Days
- Healthy Volunteers: t

Study Arms:
- sIPV+bOPV+bOPV (Type: EXPERIMENTAL): 202 subjects were vaccinated with 1 dose of Sabin-IPV and 2 doses of bOPV at their age of 2/3/4 months old, respectively
- sIPV+sIPV+bOPV (Type: ACTIVE_COMPARATOR): 197 subjects were vaccinated with 2 doses of Sabin-IPV and 1 dose of bOPV at their age of 2/3/4 months old, respectively
- sIPV+sIPV+sIPV (Type: ACTIVE_COMPARATOR): 205 subjects were vaccinated with 3 doses of Sabin-IPV at their age of 2/3/4 months old, respectively

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