Complete the Identity $\tan ^ { 4 } \theta - \sec ^ { 4 } \theta =$

Multiple Choice

Complete the identity.
- $\tan ^ { 4 } \theta - \sec ^ { 4 } \theta =$ ?

A) $- 2 \tan ^ { 2 } \theta - 1$
B) $\sec ^ { 2 } \theta + \tan ^ { 2 } \theta$
C) $\sec ^ { 2 } \theta$
D) $\tan ^ { 2 } \theta - \sec ^ { 2 } \theta$