Which expression is equivalent to (x1/2+1)2(x^{1/2} + 1)^2(x1/2+1)2?
x+2x1/2+1x + 2x^{1/2} + 1x+2x1/2+1
x+1x + 1x+1
x2+1x^2 + 1x2+1
x1/4+1x^{1/4} + 1x1/4+1