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Which of the following could be a solution to the differential equation $\cfrac{dy}{dx} = \cfrac {\cos {x}}{y}$?

I. $y=-\sqrt{2\sin{x}}$ II. $y=-\sqrt{2\sin{x} +\pi}$ III. $y=\pi -\sqrt{2\sin{x}}$

I. $y=-\sqrt{2\sin{x}}$

II. $y=-\sqrt{2\sin{x} +\pi}$

III. $y=\pi -\sqrt{2\sin{x}}$

I only.

II only.

I and II only.

I and III only.