The amplitude and the time period in a $S.H.M.$ is $0.5 \,cm$ and $0.4 \,sec$ respectively. If the initial phase is $\pi /2$ radian, then the equation of $S.H.M.$ will be
  • A$y = 0.5\sin 5\pi t$
  • B$y = 0.5\sin 4\pi t$
  • C$y = 0.5\sin 2.5\pi t$
  • D$y = 0.5\cos 5\pi t$
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