A body starting from rest has the following combinations of acceleration, position, velocity and at one instant while its initial displacement is given as the fourth variable. Which of the following combinations describes $SHM$:

Question

$\begin{array}{1 1}(a)\;6,3.5,3,2 \\(b)\;5,4,1,1 \\( c)\; 7,3,2,1 \\(d)\; All\;of\;the\;above \end{array}$