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Global stiffness K is a______ matrix.

a) Identity matrix
b) Upper triangular matrix
c) Lower triangular matrix
d) Banded matrix

Answer: d
Explanation: A banded matrix is a sparse matrix whose non zero entities are confined to a diagonal band, comprising the main diagonal and zero or more diagonals on either side. A global stiffness matrix K is a banded matrix. That is, all the elements outside the band are zero.

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