Please answer this correctly, I will make sure to upvote you.

Determine the smallest cross$-$sectional area A required for the members of the truss shown so that the horizontal deflection at joint $D$ does not exceed $10$ mm$.$

$1$

$=Ua$

a$.1393m{m}^2$

b$.3381m{m}^2$

c$.3036m{m}^2$

d$.2953m{m}^2$

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Incorrect