Let ( A = (0, 0) ), ( B = (7, 0) ), and ( C = (7, 5) ). Point ( D ) is located so that angle ( ACD ) is a right angle, and the tangent of angle ( DAC ) is ( 5/7 ). Find coordinates for ( D ).
a) ( D = (3, 4) )
b) ( D = (4, 3) )
c) ( D = (5, 2) )
d) ( D = (2, 5) )