An identity matrix is a diagonal matrix in which all of the diagonal elements are equal to .

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Solution

The correct option is B 1
An identity matrix is a diagonal matrix in which all of the diagonal elements are equal to 1.

Below one is the identity matrix:

B = $⎡ ⎢ ⎢ ⎢ ⎣ \begin{matrix} 1 & 0 & 0 & 0 0 & 1 & 0 & 0 0 & 0 & 1 & 0 0 & 0 & 0 & 1 \end{matrix} ⎤ ⎥ ⎥ ⎥ ⎦$

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