Figure ABCDEF Was reflected across the line y=-x to crate figure A'B'C'D'E'F' What are the coordinates of the preimage of F'

A: (-2,4)
B: (4,2)
C:(2,-4)
D:(-4,-2)

I'm so confused. I was going to do c because, your supposed to switch the coordinates and negate them... But then when I wanted to check my work I looked it up and got three diffrent anwsers ( one was I was right the others i was wrong) Please help on a timed test.