a) have to be of a fixed size
b) have to be a variable size
c) can be fixed or variable sized
d) none of the mentioned
Answer: c
Explanation: Messages sent by a process can be fixed or variable size. If the message size of the process is fixed then system level implementation is straightforward but it makes the task of programming more difficult. If the message size of the process is variable then system level implementation is more complex but it makes the task of programming simpler.
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