Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(I) They do not need to reproduce.
(II) They are somatic cells.
(III) They do not metabolise.
(IV) All their internal space is available for oxygen transport.
(a) Only (IV)
(b) Only (I)
(c) (I), (III) and (IV)
(d) (II) and (III)