Find (f o g)(x) and its domain when f(x) = x^2 + 2 and g(x) = √(x + 5):
A. (f o g)(x) = x^2 + √(x + 5) + 2; Domain: All real numbers
B. (f o g)(x) = x^2 - √(x + 5) + 2; Domain: x ≥ -5
C. (f o g)(x) = x^2 + 2√(x + 5); Domain: x ≥ -5
D. (f o g)(x) = x^2 - 2√(x + 5) + 2; Domain: All real numbers