For the four circles M, N, O and P, following four equations are given :
Circle M : `x^2 + y^2=1`
Circle N : `x^2 + y^2– 2x=0`
Circle 0 : `x^2 + y^2 - 2x - 2y +1=0`
Circle P : `x^2 + y^2 – 2y=0`
If the centre of circle M is joined with centre of the circle N, further centre of circle N is joined with centre of the circle O, centre of circle O is joined with the centre of circle P and lastly, centre of circle P is joined with centre of circle M, then these lines form the sides of a :

Options

A. Square
B. Rectangle
C. Rhombus
D. Parallelogram