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Which of the following uses a software refresh in the DRAM?

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Which of the following uses a software refresh in the DRAM?

(a) 8086

(b) 80386

(c) Pentium

(d) Apple II personal computer

This question was posed to me in an internship interview.

Origin of the question is DRAM Refreshing Techniques topic in section Memory Systems of Embedded Systems

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Right answer is (d) Apple II personal computer

For explanation: The Apple II personal computer has a particular memory configuration, periodically the DRAM gets blocked and is used for video memory accessing to update the screen which can refresh the DRAM.

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