The given figure depicts the vector diagram of forces and displacements in the case of force(d) Damped vibration, if vector A represents the forcing function $P=P_{0}\sin \omega t$ vector B the displacement $Y=Y_{0}\sin \omega t$ and $\phi$ the phase angle between them then the vectors C and D represent respectively.
(a) The force of inertia and the force of damping
(b) The elastic force and the damping force
(c) The damping force and he inertia force
(d) The damping force and the elastic force