Use the Given Function Value(s),and Trigonometric Identities (Including the Cofunction $\sec \theta = 9$

Use the given function value(s) ,and trigonometric identities (including the cofunction identities) ,to find the indicated trigonometric functions.? $\sec \theta = 9$ ? cos ?
?

A) $\cos \theta = 9$
B) ? $\cos \theta = \frac { 1 } { 9 }$
C) ? $\cos \theta = - \frac { 1 } { 9 }$
D) ? $\cos \theta = - 9$
E) ? $\cos \theta = 0$