In a distributed environment, a surrogate program that performs services
in one environment on behalf of a principal in another environment is
called:

A.
A proxy.

B.
A slave.

C.
An agent.

D.
A virtual processor.

Explanation:
The correct answer is An agent.
* Proxy is similar in nature but might hide the characteristics of the principal it is representing.
Answers A slave and A virtual processor are distracters.