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What is a diagonal matrix? A diagonal matrix is a square matrix where at least one element of the main diagonal is not zero and the others are all...

What is a diagonal matrix?

A diagonal matrix is a square matrix where at least one element of the main diagonal is not zero and the others are all zeros.
A diagonal matrix is a rectangular matrix where all elements are zero except for those on the main diagonal.
A diagonal matrix is a square matrix where all elements are equal to a non-zero scalar.
A diagonal matrix is a rectangular matrix where all elements are equal to a non-zero scalar.
a) I and III are correct.
b) II and III are correct.
c) I and IV are correct.
d) II and IV are correct.