Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
-Find $\cos \theta$ , given that $\cos 2 \theta = \frac { 1 } { 4 }$ and $\theta$ terminates in quadrant I.

A) $\frac { \sqrt { 8 - 2 \sqrt { 10 } } } { 4 }$
B) $\frac { \sqrt { 6 } } { 4 }$
C) $\frac { \sqrt { 10 } } { 4 }$
D) $\frac { \sqrt { 8 - 2 \sqrt { 5 } } } { 2 }$

Correct Answer:

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