The purpose of the delay line is to retard the arrival of

The purpose of the delay line is to retard the arrival of the input waveform at the:

1. Vertical deflection plates until the sweep is started
2. Vertical deflection plates until the sweep is completed
3. Horizontal deflection plates until the sweep is started
4. Horizontal deflection plates until the sweep is completed

The purpose of the delay line is to retard the arrival of the input waveform at the vertical deflection plates until the sweep is started.