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Which of the following have low-level buffer filling?

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Which of the following have low-level buffer filling?

(a) output

(b) peripheral

(c) dma controller

(d) input

I had been asked this question during an interview for a job.

The above asked question is from DMA in chapter Basic Peripherals of Embedded Systems

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Correct answer is (c) dma controller

The best explanation: The DMA controller can initiate and control the bus access between I/O devices and memory, and also between two different memory areas. Therefore, the DMA controller can act as a hardware implementation of low-level buffer filling or emptying the interrupt.

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