The beam \(A B\) will fail if the maximum internal moment at \(D\) reaches \(4.50 \mathrm{kN} \cdot \mathrm{m}\) or the normal force in member \(B C\) becomes \(6 \mathrm{kN}\). Determine the largest concentrated force \(P\) it can support.

P D B 1 m -1 m -1 m 0.5 m '0.5 m 0.75 m