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Which of the following uses a timer for refresh technique?

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Which of the following uses a timer for refresh technique?

(a) RAS

(b) CBR

(c) software refresh

(d) CAS

The question was asked in an online interview.

Question is taken from DRAM Refreshing Techniques in section Memory Systems of Embedded Systems

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The correct choice is (c) software refresh

The explanation is: The software refresh performs the action by using a routine to periodically cycle through the memory and refreshes. It uses a timer in the program generating an interrupt. This interrupt performs the refreshing part in the DRAM.

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