Model the Curve with a Cosine Function $P = \frac { 1 } { 6 }$

Multiple Choice

Model the curve with a cosine function.
Note that the period of the curve is $P = \frac { 1 } { 6 }$ and its range is $[ - 1,1 ]$ .

A) $f ( x ) = \cos ( 12 x )$
B) $f ( x ) = \cos \left( \frac { \pi x } { 12 } \right)$
C) $f ( x ) = \cos ( 12 \pi x )$
D) $f ( x ) = 12 \cos ( \pi x )$
E) $f ( x ) = \cos \left( \frac { x } { 12 } \right)$