Find the Compositions F ◦ G and G ◦ F

Multiple Choice

Find the compositions f ◦ g and g ◦ f, and identify their respective domains. f (x) = x² + 9, g(x) = cos x

A) (f ◦ g) (x) = cos(x² + 9) , 0 < x (g ◦ f) (x) = cos² x + 9, 8 < x < 10
B) (f ◦ g) (x) = cos(x² + 9) , all reals (g ◦ f) (x) = cos² x + 9, all reals
C) (f ◦ g) (x) = cos² x + 9, all reals (g ◦ f) (x) = cos(x² + 9) , all reals
D) (f ◦ g) (x) = cos² x + 9, 8 < x < 10 (g ◦ f) (x) = cos(x² + 9) , 0 < x