Consider the following figure.

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Show that the stress at corner $A$ of the prismatic member shown in part $a$ of the figure will be zero if the vertical force $P$ is applied at a point located on the line $\frac{x}{b}+,\frac{z}{h}=1$