Correct option is B
An
Offline UPS, also known as a
Standby UPS or
Line-Preferred UPS, remains in standby mode during normal power conditions. The load is directly powered by the main supply, and the UPS switches to battery backup only when the main supply fails or experiences disturbances.
·
Online UPS: Provides continuous power from the battery, even during normal conditions.
·
Rotary UPS: Uses a rotating mechanical device for power backup.
