Deadlock

Question

Which of the following  can cause deadlock

A) Files

B) Printer

C) Shared files

D) All of the above

How is D not the answer and B is

Comments

The only way you get a deadlock is that you have one or more processes waiting for it, but no processes releasing it . If you have one process holding it, then that process MUST release it.

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How can you say B is the answer?

Two processes can not write on a file at the same time, so this has to be synchronized.

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I have the same question to be honest