Progressive and stationary waves

Medium

Which row correctly identifies both the phase and amplitude relationships of points on the string?

$Q$ is in phase with $R$ | $P$ and $Q$ have the same amplitude

$P$ is in phase with $R$ | $P$ has a larger amplitude than $R$

$Q$ is in phase with $R$ | $P$ has a larger amplitude than $R$

$P$ is in antiphase with $Q$ | $Q$ has a larger amplitude than $R$

Progressive and stationary waves Questions