Solve the Problem $f(a)$ When $f(x)=-x^{2}-4 x-6$
A) $2 a$ B) $a^{2} - 4a - 6$

Multiple Choice

Solve the problem.
-Find $f(a)$ when $f(x) =-x^{2}-4 x-6$ .

A) $2 a$
B) $a^{2} - 4a - 6$
C) $-a^{2} - 4a$
D) $-a^{2} - 4a - 6$