Effective Radiated Power means the:

Effective Radiated Power (ERP) is a standard measure of the directional radio frequency (RF) power emitted by an antenna system. It represents the power that would need to be fed into a standard reference half-wave dipole antenna to achieve the same signal strength in the direction of maximum antenna gain. To calculate ERP, you start with the transmitter's output power, subtract any losses incurred in the transmission line and connectors, and then add the antenna's gain (usually expressed in dBd, or decibels relative to a dipole). The other options are incorrect because they either ignore line losses, use the wrong reference point (like raw power supplied), or describe different concepts entirely, such as amplifier gain ratios.