The equation of motion of a particle is $\frac{{d}^{2}y}{d{t}^{2}}+Ky=0$ where K is positive constant. The time period of the motion is given by

(a) $\frac{2\mathrm{\pi }}{K}$             (b) $2\mathrm{\pi K}$

(c) $\frac{2\mathrm{\pi }}{\sqrt{K}}$           (d)  $2\pi \sqrt{K}$