Choose C, when it is on the X axis or Y axis, the dual points of Yi are all on the X axis or Y axis, when it is not on the X axis or Y axis.

According to √(Xa? +Ya？ )(Xb？ +Yb？ ) = 1 and Xa=λXb, Ya=λYb, finishing x? +Y？ = 1/√λ, when λ is equal, four points are * * * circles, so choose C.