The truss shown below was built using $W1453$ steel with a service load $P=250kN$ applied at joint $A.$

Assume $k=0\mathrm{.}85$ and use ASD and A$36.$ Ignore weights of truss members.

a$)$ Determine the degree of indeterminacy.

b$)$ Calculate the internal forces of all compressive members in $kN.$

c$)$ Find the allowable compressive strength in $kN$ for members under compression.

d$)$ Determine the adequacy $(\frac{D}{C}$ ratio$)$ of all compressive member$/$s in the truss shown.