A triangle is formed by the lines whose combined equation is given by (x+y-4)(xy-2x-y+2)=0 . The equation of its circumcircle is
A.bx²+y²-5x-3y-8=0
B. x2 + y25x-3y + 8 = 0
C. x²+y²-3x-5y+8=0
D. none of these