Which of the following is not a criterion for congruence of triangles?

Two sides $AB$ and $BC$ and median $AM$ of one triangle $ABC$ are respectively equal to sides $PQ$ and $QR$ and median $PN$ of $\Delta PQR$ (see Fig). Show that:
$(i)$ $\Delta ABM \cong \Delta PQN$
$(ii)$ $\Delta ABC \cong \Delta PQR$

$E$ and $F$ are respectively the mid-points of equal sides $AB$ and $AC$ of $\Delta ABC$ (see figure). Show that $BF = CE$.

In the given figure,if $PQ = ST$,$QU = TR$,$PQ \perp QT$ and $ST \perp TQ$,then prove that $PR = SU$.

Line-segment $AB$ is parallel to another line-segment $CD$. $O$ is the mid-point of $AD$ (see Fig). Show that $(i)$ $\Delta AOB \cong \Delta DOC$ $(ii)$ $O$ is also the mid-point of $BC$.

If $AB = QR$,$BC = PR$,and $CA = PQ$,then