Out of the following functions, representing motion of a

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Out of the following functions, representing motion of a particle, which represents SHM?
(A) y = sin ωt - cos ωt
(B) y = sin³ ωt
(C)
y = 5 cos 3π - 3ωt
4

(D) y = 1 + ωt + ω² t²

1. Only (A)
2. Only (D) does not represent SHM
3. Only (A) and (C)
4. Only (A) and (B)

Correct Option: C

Only functions given in (A) & (C) represent SHM.