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Answer :
(a) \(\overleftrightarrow {AE} \)
(b) \(\overleftrigharrow {AE} \)
(c) \(\overleftrigharrow {OC} \)
(d) \(\overleftrigharrow {AE} , \overleftrigharrow {OC} and
\(\overleftrigharrow {AE}, \(\overleftrigharrow {EF}