Possession certificate for BDA auction plot

Hi All, I bought a corner residential odd site during recent BDA auction and got it registered couple of days ago. While I apply for possession certificate for the same in Seva Sindhu link, there is a question "Does the odd site have A1 and A2 categories ?"  yes or no ? . Not sure about this A1 and A2 categories and Which option to select. Could anyone please guide me to understand this and help me raising request to get possession certificate. Thanks, Mahesh