One of the lines of ms² + 1) m²xy) mx² = 0 is the bisector of the angle between the lines:

a) x) y = 0 and x + y = 0
b) x) y = 0 and x + y = 2
c) x) y = 2 and x + y = 0
d) x) y = 1 and x + y = 1