Which scheduling test is used to indicate that no scheduling exist even if there exist one?

Which scheduling test is used to indicate that no scheduling exist even if there exist one? Correct Answer sufficient test

The sufficient condition indicates that no schedule exists even if there exist one and the necessary condition indicates that no schedule exists even if a schedule exists.

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Which of the following scheduling test can be used to show that no scheduling exist?
In this figure, 3 types of scheduling using preemptive scheduling policies is shown. Which of the following options is correctly referring to each of these scheduling types?