Lines a and b are perpendicular. If the points (8,p) and (9,p+4) lie on line a, and lines a and b intersect at (9,p+4), which of the following points must lie on line b?
A
(p+8,p−4)
B
(9,p−8)
C
(p,p+4)
D
(5,p+5)
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