The value of $$cos^2 30^{\circ} + sin^2 60^{\circ} + tan^2 45^{\circ} + sec^2 60^{\circ} + cos0^{\circ}$$ is

A

$$4\frac{1}{2}$$

B

$$5\frac{1}{2}$$

C

$$6\frac{1}{2}$$

D

$$7\frac{1}{2}$$