question: At frequencies below 100 kHz, the induced current ERL is exceeded if: [IEEE C95.1] option 1: The sum of the induced currents is greater than the threshold option 2: The sum of the induced currents is less than the threshold option 3: The induced current for each source is less than the threshold option 4: The induced current for each source is greater than the threshold option 5: The sum of the induced currents is equal to the threshold 