The correct answer is: B. Serial port
RS-232 is a standard that defines the electrical characteristics and mechanical interface of serial communication between devices. It is a serial communication protocol, which means that data is transmitted one bit at a time. RS-232 is often used for connecting computers to peripheral devices, such as printers, modems, and scanners.
A parallel port is a type of interface that allows multiple bits of data to be transmitted at the same time. Parallel ports are typically used for connecting printers to computers.
A game port is a type of interface that allows game controllers to be connected to computers. Game ports are typically used for older games that do not support USB controllers.
Therefore, the correct answer is B. Serial port.