Choose the best definition of resonance: Group of answer choices The maximum transfer of energy between 2 systems; it is happening only when their frequencies are equal The maximum transfer of energy between 2 systems; it is happening only when the frequency of the source is smaller than the frequency of the receiver The maximum transfer of energy between 2 systems; it is happening only when the frequency of the source is higher than the frequency of the receiver The minimum transfer of energy between 2 systems; it is happening only when their frequencies are equal