How to distinguish average response from True-RMS?

Ture RMS is a representation of non-normal AC signal.
Average Response Measurement: The average value multiplies by the waveform factor to obtain the value of AC signal.
True-RMS Measurement: The value of AC signal is obtained by the root mean square algorithm. For pure sine wave, accurate measurement can be achieved by average response or True-RMS; while for distorted waveforms or general non-sine waves such as square wave, triangular wave, sawtooth wave, an accurate measurement can be obtained by True-RMS only.