Which sub-system consists of jobs that require the interaction of personnel with the general environment?

I agreed with Sir Krishna KHASANIS. 

Something is really missing. I kinda choose feedback but in reality, this system is really not that strong.

Thanks for the invitation!

My Answer is (B).Thank you for the Invitation.

 Thanks for invitation ..................... my answer is B

the correct answer is B

regards

Feedback, because they deal with customers and their experience 

The right option should be B

option (b) is the correct answer

Thanks for invitation,

I do believe that the correct answer is "C".

Thanks for the invitation.

I feel correct option is not given. I am not sure Boundary spanning is rightly applicable to the given situation. But then I could be wrong also.

Take ( B ) answer .

...Thanks for you ...