The characteristics of H and V sync pulses in a colour TV receiver are

1. H sync, pulses are narrow and have frequency of 15625 Hz
2. V sync, pulses are much wider and have frequency of 50 Hz
3. H and V pulses have almost the same size but frequencies of 15625 and 50 Hz respectively
4. V sync, pulses are very narrow but H sync, pulses are wide and their frequencies are 15625 Hz and 50 Hz respectively

Which of the above are correct?