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