Hello, As you said you have  passed 12th in 2016 so you have to enter code 2 . 

Criteria for  Code 02 =
Any Student from CBSE/ICSE Board who has passed the 12th Examination not taken examination in any college. e.g.. Droppers. Students from STATE Board where 10+2 structure is followed should also use this code if they have successfully passed the Examination.