Why is read only memory (ROM) called 'read only'?单项选择题

题目图片
A

a. Because all of the instructions stored in ROM will disappear if the device is turned off

B

b. The instructions can be read, but not altered or changed

C

c. Because all the data used by a device is stored in ROM

D

d. Because the user can save data to ROM so others can read the data

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