Which of these is the polar form of z=−1+iz = -1+iz=−1+i?
2eiπ/4\sqrt{2}e^{i\pi/4}2eiπ/4
2eiπ/42e^{i\pi/4}2eiπ/4
2ei3π/4\sqrt{2}e^{i3\pi/4}2ei3π/4
2ei3π/42e^{i3\pi/4}2ei3π/4