If $$\frac{\cos A}{1-\sin A} + \frac{\cos A}{1 + \sin A} = 4$$, then what will be the value of A? $$(0^{\circ} < \theta < 90^{\theta})$$

A

$$90^{\circ}$$

B

$$45^{\circ}$$

C

$$60^{\circ}$$

D

$$30^{\circ}$$