In indirect communication between processes P and Q __________

A. There is another process r to handle and pass on the messages between p and q
B. There is another machine between the two processes to help communication

C. There is a mailbox to help communication between p and q

D. None of the mentioned

Explanation: In indirect communication between processes P and Q there is a mailbox to help communication between P and Q. A mailbox can be viewed abstractly as an object into which messages can be placed by processes and from which messages can be removed.

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