Out of the following functions representing motion of a particle which represents SHM : <br> (A) $y = \sin \omega t - \cos \omega t$ <br> (B) $y = \sin^3 \omega t$ <br> (C) $y = 5 \cos (\frac{3 \pi}{4} - 3 \omega t)$ <br> (D) $y = 1 + \omega t + \omega^2 t^2$

Question

( A ) Only (A)
( B ) Only (D) does not represent SHM
( C ) Only (A) and (B)
( D ) Only (A) and (C)