Which one of the following is true for a CPU having a single

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Which one of the following is true for a CPU having a single interrupt request line and a single interrupt grant line?

1. Neither vectored interrupt nor multiple interrupting devices are possible
2. Vectored interrupt are not possible but multiple interrupting devices are possible
3. Vectored interrupt and multiple interrupting are both possible
4. Vectored interrupt is possible but multiple interrupting devices are not possible

Correct Option: B

In single line interrupt system, vectored interrupts are not possible but multiple interrupting devices are possible as a single line interrupt system consists of a single interrupt system consists of a single interrupt request line and a interrupt grant line in such a system it may be possible that at the same time more than one output devices can request an interrupt, thus in such cases only one request will be granted according to the priority as is depicted by the following figure, but the interrupt is granted to the single request only.