Given f(x)=2xf(x) = 2^xf(x)=2x, which of the following is equal to f(x+3)f(x+3)f(x+3)?
f(x)+8f(x) + 8f(x)+8
8f(x)8f(x)8f(x)
f(x)+3f(x) + 3f(x)+3
3f(x)3f(x)3f(x)