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The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig. [add image] $y$-projection of the radius vector of rotating particle $P$ is:
A
$y(t)=-3\cos2\pi t$, where $y$ in m
B
$y(t)=4\sin\left(\frac{\pi t}{2}\right)$, where $y$ in m
C
$y(t)=3\cos\left(\frac{3\pi t}{2}\right)$, where $y$ in m
D
$y(t)=3\cos\left(\frac{\pi t}{2}\right)$, where $y$ in m