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HAL_Delay inside an interrupt

An STM32 EXTI button ISR calls HAL_Delay(20) for debouncing, and the board freezes on the first press. Why?

A.HAL_Delay is not linked into ISR code, so the call jumps to an invalid addressB.HAL_Delay waits for the SysTick count, which cannot advance while this ISR blocks SysTickC.The EXTI line cannot be cleared while a delay is running, so the ISR repeatsD.HAL_Delay resets the watchdog each time, and that stops the CPU clock

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HAL_Delay inside an interrupt

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