What characteristic of read-only memory (ROM) makes it useful?

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What characteristic of read-only memory (ROM) makes it useful?

Options are:

a. ROM information can be easily updated.
b. Data in ROM is non-volatile, that is, it remains there even without electrical power.
c. ROM provides very large amounts of inexpensive data storage.
d. ROM chips are easily swapped between different brands of computers.

Correct answer is: (b)

b. Data in ROM is non-volatile, that is, it remains there even without electrical power.