If c is the velocity of light in free space, the correct statements about photon among the following are: 

A. The energy of a photon is E = hv.

 B. The velocity of a photon is c. 

 C. The momentum of a photon p= h p c .

 D. In a photon-electron collision, both total energy and total momentum are conserved. 

 E. Photon possesses positive charge.    

Choose the correct answer from the options given below: 

1) A and B only

2) A, B, C and D only

3) A, C and D only

4) A, B, D and E only

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