Given $f(x)$ And $g(x)$ , Find the Indicated Composition and State Its Domain

Multiple Choice

Given $f(x)$ and $g(x)$ , find the indicated composition and state its domain.
- $f(x) =x^{2}-6, g(x) =2 x+4$
Find $(f \circ g) (x)$ .

A) $4 x^{2}+16 x+16$ , all real numbers
B) $4 x^{2}+8 x+10$ , all real numbers
C) $2 x^{2}-8$ , all real numbers
D) $4 x^{2}+16 x+10$ , all real numbers