Calculate the surface area of the plane z=2x+2yz = 2x + 2yz=2x+2y restricted to the unit disk x2+y2≤1x^2 + y^2 \leq 1x2+y2≤1.
3π3\pi3π
4π4\pi4π
π5\pi\sqrt{5}π5
3π23\pi\sqrt{2}3π2