Problem $2$

In the structure shown, a $10mm$ diameter pin is used at $C,B,$ and $D.$ Knowing that $P=2\mathrm{.}0kN$ and the modulus of elasticity of the material $E=200$GPa.

Determine

a$)$ The shear stress in the pin at joint $C.$

b$)$ The maximum normal stress in the link of the member BD$.$

c$)$ The critical bearing stress at joint D$.$

d$)$ The deflection of point $A.$

Please solve and help me understand