Solve the Problem $\sec \theta$ If $\cos \theta = \frac { 1 } { 4 }$

Multiple Choice

Solve the problem.
-Find $\sec \theta$ if $\cos \theta = \frac { 1 } { 4 }$ and $\sin \theta > 0$ .

A) $\sqrt { 15 }$
B) $\frac { \sqrt { 15 } } { 15 }$
C) 4
D) $- 4$