Which expression represents the modulus of z=a+biz = a + biz=a+bi?
∣z∣=a+b|z| = a + b∣z∣=a+b
∣z∣=a2+b2|z| = \sqrt{a^2 + b^2}∣z∣=a2+b2
∣z∣=a2+b2|z| = a^2 + b^2∣z∣=a2+b2
∣z∣=a+b|z| = \sqrt{a + b}∣z∣=a+b