The correct answer is: A. Dip switch.
A SCSI terminator is a device that is used to terminate the SCSI bus. It is usually a small, rectangular device with three or five pins. The terminator is connected to the last device on the SCSI bus.
There are two types of SCSI terminators: active and passive. Active terminators provide a voltage to the SCSI bus, while passive terminators do not. Active terminators are usually used on the last device on the SCSI bus, while passive terminators can be used on any device on the SCSI bus.
SCSI terminators are usually installed by flipping a switch or plugging in a cable. Some SCSI devices have built-in terminators, so no external terminator is required.
BNC connectors are used to connect coaxial cables to devices. They are typically used for video and audio signals. BNC connectors are not used for SCSI cables.
Resistor is an electrical component that is used to resist the flow of current. Resistors are used in a variety of applications, including power supplies, circuits, and sensors. Resistors are not used for SCSI cables.