The circular rod shown has dimensions $d_1=6\mathrm{.}6cm,L_1=6m,d_2=4cm,$ and $L_2=4m$ with applied loads $F_1=100kN$ and

$F_2=40kN.$ The modulus of elasticity is $E=100$GPa. Determine the deflection at point $D.$ Point $B$ is halfway between

points A and C$.$ Displacement to the right is considered positive.

a$)-1\mathrm{.}1mm$

b$)1\mathrm{.}1mm$

c$)2\mathrm{.}15mm$

d$)-2\mathrm{.}15mm$