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(D) None of the options provided is correct without exceptions.$1$. In $(a)$, $Cyclostomata$ do not have paired appendages.$2$. In $(b)$, the skin of

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(D) None of the options provided is correct without exceptions.$1$. In $(a)$, $Cyclostomata$ do not have paired appendages.$2$. In $(b)$, the skin of $Aves$ is dry and non-glandular (except for the oil gland at the base of the tail).$3$. In $(c)$, while $Mammalia$ are characterized by mammary glands and hair, not all mammals have pinnae (e.g., monotremes) or two pairs of limbs (e.g., whales and dolphins lack hindlimbs).$4$. In $(d)$, while $Chondrichthyes$ generally have gills without an operculum, there are exceptions like $Chimaera$ (ratfish), which possesses an operculum.

$Option$	$Characteristics$
$(a)$	$Cyclostomata$: Sucking and circular mouth; jaws absent, integument without scales; paired appendages.
$(b)$	$Aves$: Body covered with feathers; skin moist and glandular, fore-limbs form wings; lungs with air sacs.
$(c)$	$Mammalia$: Mammary gland; hair on body; pinnae; two pairs of limbs.
$(d)$	$Chondrichthyes$: Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord.

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