Given the functions, f(x) = x2 + 2 and g(x) = 4x - 1, perform the indicated operation. When applicable, state the domain restriction.
g(f(x)).

Answer choices:

1. 4x2 + 1
2. 4x2 + 7
3. 16x2 - 8x + 3
4. 16x2 + 3