$$\sin 0^\circ + \cos 30^\circ - \tan 45^\circ + \cosec 60^\circ + \cot 90^\circ =$$

A

$$\frac{7\sqrt{3} - 6}{2\sqrt{3}}$$

B

$$\frac{7\sqrt{3} + 6}{6}$$

C

$$\frac{7\sqrt{3} - 6}{6}$$

D

$$\frac{7\sqrt{3} + 5}{6}$$