If $\large\frac{dy}{dx}$$=2e \cos (\omega t+ \phi)$ the dimensional formula for $(\omega t +\phi)$ is

Question

$\begin{array}{1 1} (a) \;MLT\\ (b) \;MLT^0 \\ (c) \;ML^0T^0 \\ (d) \;M^0L^0T^0 \end{array}$