Find the truth gets simpler and complex

Algebra Level 4

Which of the following are always true?

a) $i^x$ is imaginary if $x$ is imaginary.
b) $x^i$ is imaginary if $x$ is imaginary.
c) $x^x$ is imaginary if $x$ is imaginary.

a

and

b

b

only All of these choices None

c

only

a

and

c

a

only

b

and

c