If `vec F` is the force acting in a particle having position vector `vec r` and `vec tau` be the torque of this force about the origin, then

Options

A. `vec r . vec F` = 0 and `vec F . vec tau !=0`
B. `vec r . vec F` gt 0 and `vec F . vec tau lt 0`
C. `vec r . vec F` = 0 and `vec F . vec tau = 0`
D. `vec r . vec F` = 0 and `vec F . vec tau != 0`