The diagram illustrates a standing wave on a string. There are three nodes on the standing wave, $N_1$, $N_2$ and $N_3$. Which statement is correct?
- AAll points on the string vibrate in phase.
- BAll points on the string vibrate with the same amplitude.
- CPoints equidistant from $N_2$ vibrate with the same frequency and in phase.
- DPoints equidistant from $N_2$ vibrate with the same frequency and the same amplitude.