Quick practice
Question 1 of 5
A square matrix ![\mathrm{A}=\left[\mathrm{a}_{\mathrm{i}}\right]](data:image/png;base64,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){kind=small}
in which 
for 
and 
constant) for i is called a
A
Null matrix
B
Unit matrix
C
Diagonal matrix
D
Scalar matrix
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