Point K is located at (7, 4) in the coordinate plane. Its image is created by the following rule:
K'=Ro 90°^(k)
(x, y) → (-y, x)
What are the coordinates of K'?
A: ( - 4, 7 )
B: ( - 7, 4 )
C: ( 4, 7 )
D: ( 7, - 4 )
