Which of the following can occur if the maximum rated load is exceeded on an uninterruptible power supply （UPS）？（）

A. There is a fire hazard potential if a power outage occurs.
B. The last system plugged into the UPS will not be provided any power.
C. The UPS will draw more power from the circuit to compensate.
D. The runtime of the UPS will be insufficient if a power outage occurs.