For the structure below, where $P1=[P]lb,$ and $P2=[Q]lb,$ select the statement which is incorrect among the following statements.

Reaction forces at Joints A and $C$ could not be solved with E$-$of$-$Es$,$ because there are $3$ independ $E-$of$-$E$,$ while $4$ independent reaction force components at A and $C$ combined.

Reaction force components in $x$ and $y$ directions at Joint $A,R_{Ax}$ and $R_{Ay},$ are not independent.

Member BC is not a two$-$force member.

Member AB is a two$-$force member.