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Two stack pointers on Cortex-M

In an RTOS on Cortex-M, tasks run on PSP and interrupts use MSP. What is the main benefit for stack sizing?

A.Interrupts no longer use any stack memory at allB.ISR stack needs are counted once, not added to every taskC.Each task can use the whole of RAM as its stackD.Stack overflow becomes impossible in tasks

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Two stack pointers on Cortex-M

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