Which of the following statements about synchronous and asynchronous I/O is…

GATE · 2008 · CSISRO Scientist/Engineer SC · 2009 · Computer Science

1. A.

   An ISR is invoked on completion of I/O in synchronous I/O but not in asynchronous I/O

2. B.

   In both synchronous and asynchronous I/O, an ISR (Interrupt Service Routine) is invoked after completion of the I/O

3. C.

   A process making a synchronous I/O call waits until I/O is complete, but a process making an asynchronous I/O call does not wait for completion of the I/O

4. D.

   In the case of synchronous I/O, the process waiting for the completion of I/O is woken up by the ISR that is invoked after the completion of I/O

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