A technician is installing a new system in a facility that requires zero downtime. The facility uses a backup generator in case of power loss. Into which of the following power sources should the technician plug the system to offer optimal uptime? 

Answer options:

A. Only a surge protector is needed due to the backup generator
B. Plug directly into the emergency power source
C. Plug a surge protector directly into the UPS
D. Connect to a UPS that utilizes the emergency power source

D