Determine the Period and Amplitude of the Following Function $$y = 3 \cos \left( \frac { 2 x } { 3 } - \frac { 1 } { 6 } \right)$$

Multiple Choice

Determine the period and amplitude of the following function $$y = 3 \cos \left( \frac { 2 x } { 3 } - \frac { 1 } { 6 } \right)$$

A) Period: 10 $\pi$ ; Amplitude: 6
B) Period: $\frac { \pi } { 5 }$ ; Amplitude: 3
C) Period: 8 $\pi$ ; Amplitude: 4
D) Period: $\pi$ ; Amplitude: 3
E) Period: 5 $\pi$ ; Amplitude: 2