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Consider the following statements (A-D) ...

Consider the following statements (A-D) each with one or two blanks.
(A) Four characters of chordates are the presence of `overset("(i)")"_____"` dorsal hollow nervous system, `overset("(ii)")"_____"` and muscular tail
(B) Agnatha are the most primitive craniates. They are commonly called `overset("(iii)")"_____"` vertebrates
(C) Electric ray belongs to class `overset("(iv)")"_____"` while sea horse belongs to class `overset("(v)")"_____"`
(D) `overset("(vi)")"_____"` are also defined as feathered bipeds. These have a `overset("(vii)")"_____"` gland on the tail
Which one of the following options, correctly fills any two of the given statements ?

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