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