A stick of length l rests againsts the floor and a wall of a room. If the stick begins to slide on the floor, then the locus of its middle point is

Options

A. `3x^(2)+3y^(2)=l^(2)`
B. `4x^(2)+4y^(2)=l^(2)`
C. `2x^(2)+2y^(2)=l^(2)`
D. `x^(2)+y^(2)=l^(2)`

Answer

B