Least Expensive Power Protection Device

C.

The least expensive power protection device for filtering the electrical stream to control power surges, noise, power sags, and power spikes is a Surge Suppressor.

A surge suppressor is a device that protects electrical equipment from power surges, which are sudden increases in voltage that can damage or destroy electronic components. Surge suppressors work by diverting excess voltage to the ground and limiting the voltage that is supplied to the protected equipment.

In addition to protecting against power surges, surge suppressors can also filter out electrical noise, which is unwanted electrical signals that can interfere with the performance of electronic equipment. Electrical noise can be caused by a variety of sources, including other electronic devices, power lines, and radio signals.

A line conditioner is a more advanced power protection device that not only filters out power surges and noise but also regulates the voltage to ensure a steady stream of power to the equipment. A line conditioner can be more expensive than a surge suppressor.

An Uninterrupted Power Supply (UPS) is a device that provides battery backup power in the event of a power outage. A UPS can be used to protect critical equipment that cannot afford to lose power, such as servers or medical equipment. A UPS is typically more expensive than a surge suppressor or line conditioner.

An expansion bus is a type of computer bus that allows the expansion of a computer system by adding expansion cards to the bus. It is not a power protection device.

Therefore, the correct answer to this question is B. Surge Suppressor.