Mr. X is the only person in the company with expertise in the E-Commerce field. This source of power is called:

My answer is same as other experts, which is option (B)

>>>>>>>>>>> b. knowledge power.  >>>>>>>>>>>>>>>>>

......... . .. . 

b. knowledge power........... . . .

With colleagues

  b. knowledge power.

............................... b. knowledge power.

Agree with my mentors. thanks you all.

I choose option -----B

Thanks

 d. none of the above. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Option b) is answer <<<<<<<<<<<<<<<<