A 28-year-old woman from rural Maharashtra presents to the primary health centre (PHC) for routine immunization counselling before her planned pregnancy. She has completed her childhood vaccination schedule but is concerned about which vaccines she should receive now. The health worker informs her that some vaccines cannot be given during pregnancy and must be administered before conception. The woman asks specifically about the polio vaccine — whether the inactivated polio vaccine (IPV) or oral polio vaccine (OPV) would be safer if she becomes pregnant within 3 months. What is the most appropriate vaccine to recommend for this woman?