Correct option is A
The certificate number in the IB ACIO application refers to the unique identification number mentioned on any official certificate you upload or submit. This includes documents like caste certificate, EWS certificate, disability certificate, or other reservation-related documents. The number is usually found on the top portion of the certificate and is used for verification by the authorities. Candidates must ensure they enter the correct certificate number while filling out the application form. Providing incorrect or mismatched details may lead to disqualification or rejection during the document verification or interview process.