Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Complete the identity.
- $\sec ^ { 4 } \theta - 2 \sec ^ { 2 } \theta \tan ^ { 2 } \theta + \tan ^ { 4 } \theta = ?$

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