Solve the Following Equation $$4 \cos x + 2 = 0$$

Multiple Choice

Solve the following equation.​ $$4 \cos x + 2 = 0$$ ​

A) ​ $\frac { 4 \pi } { 3 } + n \pi , \frac { 2 \pi } { 3 } + n \pi$
B) ​ $$\frac { 2 \pi } { 3 } + 2 n \pi , \frac { 4 \pi } { 3 } + 2 n \pi$$
C) ​ $$\frac { 7 \pi } { 6 } + 2 n \pi , \frac { 11 \pi } { 6 } + 2 n \pi$$
D) ​ $\frac { \pi } { 3 } + n \pi , \frac { \pi } { 3 } + n \pi$
E) ​ $\frac { \pi } { 2 } + n \pi , \frac { 2 \pi } { 5 } + n \pi$