Step 1: Understand the immunization schedule.
The immunization schedule includes the following vaccines:
- Oral Polio Vaccine: 0 dose (B) at birth.
- DPT Booster: 1 (C) at 18 months.
- Measles: 1 dose (D) at 9 months.
- Inactivated Polio Vaccine (A): Given at 6, 10, and 14 weeks.