State the Period of the Function:​ $$y = \frac { 1 } { 2 } \sec \frac { \pi x } { 5 }$$

Multiple Choice

State the period of the function:​ $$y = \frac { 1 } { 2 } \sec \frac { \pi x } { 5 }$$ ​

A) ​14
B) 10
C) $$\frac { \pi } { 5 }$$
D) $$10 \pi$$
E) 12