If f(x)=2xf(x) = 2^xf(x)=2x, which of the following expressions represent f(x+2)f(x+2)f(x+2)?
2x+42^x + 42x+4
4⋅2x4 \cdot 2^x4⋅2x
22⋅f(x)2^2 \cdot f(x)22⋅f(x)
2x+22^x + 22x+2