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

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

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.

What is embedded system?

What is embedded system?

A. The programme which arrives by being wrapped in box.
B. The programme which is the permanent part of the computer
C. The computer which is the part of a larger system or machine
D. The computer and software system that control the machine