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Is this task set schedulable

Three periodic tasks run under rate-monotonic priorities with execution time C and period T of (1 ms, 4 ms), (2 ms, 8 ms) and (3 ms, 12 ms). What does the Liu and Layland bound say?

A.Total use is 75%, over the 69% bound, so it may failB.Total use is 100%, so it cannot be scheduledC.Total use is 75%, under the 78% bound, so it is schedulableD.Total use is 50%, so priorities do not matter

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Is this task set schedulable

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