A particle in simple harmonic motion is instantaneously at its extreme right position x=+A. Which statement about the restoring force F acting on it at that instant is correct?
(a) F is zero because the particle is momentarily at rest.
(b) F maintains a constant magnitude kA at all positions and is always directed towards the equilibrium position.
(c) F has maximum magnitude and is directed towards the equilibrium position.
(d) F has maximum magnitude and is directed away from the equilibrium position.