Sir, 1st and 2nd options are right i guess, because in NCERT - 1) Mammals show unique feature of mammary glands, hair on body and pinna and 2 pairs of limbs are also present, so 1 is Right. 2)Chondrichthyes have ventral mouth, gills without operculum, placoid scales, and persistent notocord too according to the NCERT, so that is also right 3)This option is given correct by you but NCERT does not mention that Cyclostomes have paired appendages so EVERYONE WILL GET CONFUSED BETWEEN OPTION 1 AND 2 AND WILL NOT EVEN THINK OF OPTION 3 4) This option is directly wrong coz Aves have non-glandular skin So 1 and 2 both are correct and 3rd is wrong, right???