VFR on top IFR flight question?

When flying VFR ontop are you required to report changes of altitude to ATC? A.only if asked to do so. B.Yes C.No I have read through the Jeppesen IFR/Commercial book and it says "you should" I don't know what the real answer is "you should" could mean no your not REQUIRED. THANK YOU!!! show more When flying VFR ontop are you required to report changes of altitude to ATC?

A.only if asked to do so.
B.Yes
C.No

I have read through the Jeppesen IFR/Commercial book and it says "you should" I don't know what the real answer is "you should" could mean no your not REQUIRED.

THANK YOU!!!
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