A point P(a,b) is such that PA=PB, where A=(x+y,x-y) and B(x-y,x+y) then . . .

Question : A point P(a,b) is such that PA=PB, where A=(x+y,x-y) and B(x-y,x+y) then 

a) ax=by

b) bx=ay

c) a=x²b

d) none of these 

Doubt by Muskan

Solution : Solution Coming Soon.