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Data that must survive a power cycle and changes a few times a day is best held in

  • A.SRAM backed by the main supply
  • B.the processor's register file
  • C.mask ROM programmed at manufacture
  • D.EEPROM or an emulated equivalent in flash

Answer: D

A few thousand writes over the product's life is well within EEPROM endurance, and where the device has none a flash emulation with wear levelling serves. SRAM loses the data and mask ROM cannot be written after manufacture at all.

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