Question $2.$ Below is the Simplex table of a basic solution $($BS$)$ of a linear programming problem.

$\backslash$table$[[z_{?},x_1,x_2,x_3,x_4,$Xs$,x_6,$RHS$],[,\frac{a}{4},$b$,0,$c$,3,0,$d$],[,\backslash$table$[[4],[-1]],$e$,1,0,$f$,0,g$