1. Progestogens alone or in combination with estrogen can also be used by females as injections or implants under the skin. 2. Their mode of action is similar to that of pills 3. Their effective periods are short. Regarding 1,2 and 3:

Question

( a ) 2 is incorrect but 1 and 3 are correct
( b ) 2 is correct but 1 and 3 are incorrect
( c ) 3 is incorrect; 1 and 2 are correct
( d ) 1 is incorrect but 2 and 3 are correct