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In a 3-D truss element nodal displacement vector in a local co-ordinate is q’= ___

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In a 3-D truss element nodal displacement vector in a local co-ordinate is q’= ___

(a) [q1^‘]

(b) [q2^‘]

(c) [q1^‘,q2^‘,q3^‘]^T

(d) [q1^‘,q2^‘]^T

I have been asked this question in an online quiz.

My question comes from Three Dimensional Trusses in chapter Trusses of Finite Element Method

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The correct option is (d) [q1^‘,q2^‘]^T

For explanation: Local co-ordinates are measurement indices into a local co-ordinate system or local co-ordinate space. Nodes will have nodal displacements or degrees of freedom which may include translations, rotations, and for special applications, higher order derivatives of displacements.

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