Use a Calculator to Evaluate the Trigonometric Function $\sec \left( \frac { - 5 \pi } { 8 } \right)$

Multiple Choice

Use a calculator to evaluate the trigonometric function. Round your answer to four decimal places. (Be sure the calculator is set to the correct angle mode.)
$\sec \left( \frac { - 5 \pi } { 8 } \right)$

A) $1.0006$
B) $- 1.0824$
C) $1.2331$
D) $- 2.6131$
E) $0.4142$