What is the maximum acceleration of a particle performing $SHM$ given by the equation $y = 2\sin \left( {\frac{{\pi t}}{2} + \phi } \right)$,where $y$ is in $cm$?
- A$\frac{\pi }{2} \text{ cm/s}^2$
- B$\frac{{{\pi ^2}}}{2} \text{ cm/s}^2$
- C$\frac{\pi }{4} \text{ cm/s}^2$
- D$\frac{{{\pi ^2}}}{4} \text{ cm/s}^2$
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