Determine the Period and Amplitude of the Following Function $$y = 5 \cos \left( \frac { 5 x } { 7 } + \frac { 1 } { 3 } \right)$$

Multiple Choice

Determine the period and amplitude of the following function
$$y = 5 \cos \left( \frac { 5 x } { 7 } + \frac { 1 } { 3 } \right)$$

A) Period: 16 $\pi$ ; Amplitude: 10
B) Period: $\pi$ ; Amplitude: 5
C) Period: 5 $\pi$ ; Amplitude: 6
D) Period: $\frac { \pi } { 2 }$ ; Amplitude: 5
E) Period: 8 $\pi$ ; Amplitude: 4