Reflectors are placed on the bicycle wheel at points (7, 4) and (-5, -6). After a bike ride, the reflectors have rotated 90° counterclockwise about the origin. What are the locations of the reflectors at the end of the bike ride?
a) (4, 7) and (-6, -5)
b) (-4, -7) and (6, 5)
c) (-7, 4) and (5, -6)
d) (7, -4) and (-5, 6)