Raising to imaginary powers!

Algebra Level 4

Which of the following is a possible value of the complex exponentiation:

$\large {\color{#20A900}{1}^{\color{#3D99F6}{i}}} ?$

e^{i}

e^{i\pi}

-e^{i\pi}

\log_{i}{e^{\pi}}

None of these.