If $$0 \leq \theta \leq 90^\circ$$, and $$(2\theta + 50^\circ) = \cos (4\theta + 16^\circ)$$, then what is the value of $$\theta$$ (in degrees)?

A

$$8^\circ$$

B

$$10^\circ$$

C

$$12^\circ$$

D

$$4^\circ$$