In tubectomy: 1. A small part of the fallopian tube is removed or tied up 2. It is done through a small incision in the abdomen or through ******. 3. This technique are least effective 4. But their reversibility is good. Regarding 1,2 and 3:

Question

( a ) 2 and 3 are incorrect; 1 and 4 are correct
( b ) 3 and 4 are incorrect; 1 and 2 are correct
( c ) 1 is incorrect but 2,3 and 4 are correct
( d ) 2 is incorrect but 1,3 and 4 are correct