In a △ABC, if A is (2,−1) and 7x−10y+1=0 and 3x−2y+5=0 are equations of an altitude and an angle bisector, respectively, drawn from B, then equation of BC is
a. x+y+1=0
b. 4x+9y+30=0
c. 5x+y+17=0
d. x−5y−7=0