The x-coordinates of the vertices of a square of unit area are the roots of the equation `x^2-3|x|+2=0` . The y-coordinates of the vertices are the roots of the equation `y^2-3y+2=0.` Then the possible vertices of the square is/are `(a)(1,1),(2,1),(2,2),(1,2)` `(b)(-1,1),(-2,1),(-2,2),(-1,2)` `(c)(2,1),(1,-1),(1,2),(2,2)` `(d)(-2,1),(-1,-1),(-1,2),(-2,2)`