Complex Numbers: u = i^5z is found by...

[ahat]

A: reflecting z in the Im(z) axis
B: reflecting z in the Re(z) axis
C: reflecting z in the line Im(z) = Re(z)
D: rotating z through about the origin (i.e. anticlockwise)
D: rotating z through - about the origin (i.e. clockwise)

I'm fairly certain it is C:
i⁵ = i
therefore, u = xi - y

The thing is, I have to explain why all of the other options are correct. Heck, I have to explain why my option is correct. Because the x and y values have swapped....

Help appreciated
And I hope the text wraps work!

[ahat]

Lol, my bad

D: rotating z through π/2 about the origin (i.e. anticlockwise)
E: rotating z through -π/2 about the origin (i.e. clockwise)

[brightsky]

the answer should be D. i^5*z = i*z.