The correct answer is: A. Disk drive
The first IBM PC did not have a built-in disk drive. It came with a cassette tape drive for storage, which was slow and unreliable. A floppy disk drive was an optional add-on.
RAM (Random Access Memory) is a type of computer memory that can be accessed randomly, meaning that any byte of memory can be accessed without touching the preceding bytes. RAM is used to store data and instructions that the computer is currently using.
ROM (Read-Only Memory) is a type of computer memory that can only be read from, not written to. ROM is used to store the computer’s basic instructions, which are needed to start the computer and run basic programs.
A port is a connector on a computer that allows it to communicate with other devices. Ports can be used to connect to printers, scanners, modems, and other devices.
I hope this helps! Let me know if you have any other questions.