Use an Identity to Write the Expression as a Single $\sec ^ { 4 } x + \sec ^ { 2 } x \tan ^ { 2 } x - 2 \tan ^ { 4 } x$

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- $\sec ^ { 4 } x + \sec ^ { 2 } x \tan ^ { 2 } x - 2 \tan ^ { 4 } x$

A) $\tan ^ { 2 } x - 1$
B) $3 \sec ^ { 2 } x - 2$
C) $4 \sec ^ { 2 } x$
D) $\sec ^ { 2 } x + 2$