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

Multiple Choice

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

A) $\tan ^ { 2 } \theta$
B) $\sin \theta$
C) $\cos ^ { 3 } \theta$
D) $\sec ^ { 2 } \theta$