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What are the basic unknowns on stiffness matrix method?

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in Finite Element Method by (110k points)
What are the basic unknowns on stiffness matrix method?

(a) Nodal displacements

(b) Vector displacements

(c) Load displacements

(d) Stress displacements

I had been asked this question in homework.

My enquiry is from One Dimensional Problems in division One Dimensional Problems of Finite Element Method

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Right choice is (a) Nodal displacements

The explanation: Stiffness matrix represents systems of linear equations that must be solved in order to as certain an approximate solution to the differential equation. In stiffness matrix nodal displacements are treated as basic unknowns for the solution of indeterminate structures. The external loads and the internal member forces must be in equilibrium at the nodal points.

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