Complete the Identity $\sin ^ { 2 } x + \tan ^ { 2 } x + \cos ^ { 2 } x = ?$

Multiple Choice

Complete the identity.
- $\sin ^ { 2 } x + \tan ^ { 2 } x + \cos ^ { 2 } x = ?$

A) $\sec ^ { 2 } x$
B) $\tan ^ { 2 } x$
C) $\cot ^ { 3 } x$
D) $\sin x$