CAT 2023 form for diploma guys

Hi Guys, I have done my diploma from May 2015 to May 2018 and betch from august 2018 to july 2021. I am having issue while filling CAT 2023. My diploma is of 3 year and degree of 3 yr also. should i select 3yrs for degree prog. for BTECH or 4 yrs ??
cause its showing error when i choose 4 yr option.

Can anybody suggest me?