In a linear Simple Harmonic Motion (SHM)

(A) Restoring force is directly proportional to the displacement.

(B) The acceleration and displacement are opposite in direction.

(C) The velocity is maximum at mean position.

(D) The acceleration is minimum at extreme points.

Choose the correct answer from the options given below:

• A

  $\left(\mathrm{C}\right)$ and $\left(\mathrm{D}\right)$ only
• B

  $\left(\mathrm{A}\right), \left(\mathrm{C}\right)$ and $\left(\mathrm{D}\right)$ only
• Correct answer
  C

  $\left(\mathrm{A}\right), \left(\mathrm{B}\right)$ and $\left(\mathrm{C}\right)$ only
• D

  $\left(\mathrm{A}\right), \left(\mathrm{B}\right)$ and $\left(\mathrm{D}\right)$ only

Hence, the correct answer is option: 'C'.