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The purpose of regulators in electric power distribution is to maintain a constant voltage level across the network. This is crucial because variations in voltage can lead to inefficiencies and potential damage to electrical equipment. By stabilizing the voltage, regulators ensure that consumers receive a consistent supply, which enhances the reliability of the power distribution system. This consistency helps in optimizing the performance of electrical devices and reduces the risk of outages or equipment failure caused by voltage fluctuations.

Other options present functions that do not align with the primary role of regulators. For example, regulators are not designed to convert AC to DC voltage, which is a function specific to rectifiers. They also do not typically handle power diversion during outages, as that task is managed through different systems such as switches and automatic transfer systems. Lastly, while increasing current output is a vital aspect of power distribution, regulators specifically focus on voltage levels rather than current management. Thus, the role of regulators is integral to maintaining the overall stability and efficiency of the electric power distribution system.