Question

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

Answer 1

Right option is (c) there is a mailbox to help communication between P and Q

Easiest 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.