Which of the following are the conditions of simple Harmonic motion ?1. The motion is periodic 2. The force is directed towards normal equlibrium position 3. The motion is linear 4. Force is proportional to the velocity Select the correct answer using the codes given below :

• A. 1, 3 and 4
• B. 1,2 and 3
• C. 2,3 and 4
• D. 1, 2 and 4