What is the polar form of a nonzero complex number z?

A z = r cos θ + i r sin θ with r = |z|, θ = arg z

B z = r(cos θ + i sin θ) with r = |z|, θ = arg z

C z = r e^{iθ} with r = |z|, θ = Re(z)

D z = a cos θ + b sin θ with θ = arg z

Correct Answer: Option B