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For time-dependent problems in FEA, which variables must be specified for each component of the displacement field problems?

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For time-dependent problems in FEA, which variables must be specified for each component of the displacement field problems?

(a) The initial displacement and velocity

(b) The initial displacement only

(c) The final velocity

(d) The initial displacement and final velocity

I got this question in an interview for job.

My question comes from Plane Elasticity in portion Plane Elasticity of Finite Element Method

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Correct choice is (a) The initial displacement and velocity

Easy explanation: Concerning the specification of the displacements (the primary degrees of freedom) and forces (the secondary degrees of freedom) in a finite element mesh, in general, only one of the quantities of each of the pairs (ux, tx) and (uy, ty) is known at a nodal point in the mesh. For time-dependent problems, the initial displacement and velocity must be specified for each component of the displacement field.

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