If$$\frac{\sin^{2} 30^\circ + \cos^{2} 60^\circ - \sec 35^\circ . \sin 55^\circ}{\sec 60^\circ + \cosec 30^\circ}$$ is equal to:

A

$$\frac{1}{8}$$

B

$$-\frac{1}{4}$$

C

$$\frac{1}{4}$$

D

$$-\frac{1}{8}$$