The correct answer is (b). ROM stands for Read-Only Memory. It is a type of memory that is used to store permanent data and instructions that are needed to start up a computer. ROM is not erased when the computer is turned off.
RAM stands for Random Access Memory. It is a type of memory that is used to store data and instructions that are currently being used by the computer. RAM is erased when the computer is turned off.
CPU stands for Central Processing Unit. It is the main processor of a computer. The CPU is responsible for carrying out instructions and processing data.
CDROM stands for Compact Disc Read-Only Memory. It is a type of optical disc that can be used to store data. CDROMs are read-only, which means that the data on them cannot be changed.
In conclusion, the correct answer is (b). ROM is a type of memory that is used to store permanent data and instructions that are needed to start up a computer. ROM is not erased when the computer is turned off.