In the power supply and distribution system of the data center, if a power outage occurs, the backup switching between AC power and AC power or between AC power and diesel generator is generally completed by ().

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In the power supply and distribution system of the data center, if a power outage occurs, the backup switching between AC power and AC power or between AC power and diesel generator is generally completed by ().
A . Automatic transfer switch system
B . Diesel generator system
C . Low voltage power distribution system
D . Rack power distribution system

Answer: A