Which complex number represents the point (1,−1)(1, -1)(1,−1) in the polar form?
2e−iπ/4\sqrt{2} e^{-i\pi/4}2e−iπ/4
2eiπ/4\sqrt{2} e^{i\pi/4}2eiπ/4
2ei3π/4\sqrt{2} e^{i3\pi/4}2ei3π/4
2e−iπ/42 e^{-i\pi/4}2e−iπ/4