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Which is the correct option for the following equation?

Which is the correct option for the following equation?
Ke=\(\frac{E_eA_e}{l_e}\begin{bmatrix}
1 & -1 \\ -1 & 1 \end{bmatrix}\)
a) Load vector
b) Energy matrix
c) Node matrix
d) Element stiffness matrix

Answer: d
Explanation: The given matrix is element stiffness matrix. A stiffness matrix represents the system of linear equations that must be solved in order to as certain an approximate solution to the differential equation. The stiffness matrix is a inherent property of a structure. Stiffness matrix is positive definite. Ke is linearly proportional to the product EeAe and inversely proportional to length le.

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