The correct answer is D. Computer main memory can be accessed only sequentially.
RAM (Random Access Memory) is a type of computer memory that can be accessed randomly; that is, any byte of memory can be accessed without touching the preceding bytes. ROM (Read-Only Memory) is a type of computer memory that can be read but not written to. Once data has been written to ROM, it cannot be changed or erased.
Computer main memory is a type of volatile memory, which means that it loses its contents when the power is turned off. RAM is the most common type of main memory. ROM is a type of non-volatile memory, which means that it retains its contents even when the power is turned off.
The statement “Computer main memory can be accessed only sequentially” is incorrect because RAM can be accessed randomly.