Consider the periodic waveform: v(t) = 2 + cos (ωt), where the angular frequency ω = 3.1415 radians/second. If you were to examine this waveform on the oscilloscope, draw the waveform you would see if the oscilloscope were

1) AC coupled (DC voltage level is removed)

2) DC coupled (AC + DC level displayed)

3) grounded (0 level).