Which of the following could be considered the most recent common ancestor of living tetrapods?
a. a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates
b. an armored, jawed placoderm with two pairs of appendages
c. an early ray-finned fish that developed bony skeletal supports in its paired fins
d. a salamander that had legs supported by a bony skeleton but moved with the side-to-side bending typical of fishes
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