A W$16$ composite beam is to support a uniform dead load of $1\mathrm{.}8$ k$/$ft$,$ including concrete and steel self$-$weight, and live load of $2\mathrm{.}2$ k$/$ft$.$ The beam spans $26$ ft and is spaced $10$ ft from adjacent beams. Using a $5$ in$.$ flat soffit slab and $3/4$ in$.$ shear studs, determine the least$-$weight shape to support the load if fc $=4$ ksi and A$992$ steel is used. Design by LRFD