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Mathventure Q: let R be a ring of 2 by 2 matrices with integer entries.which of the following subset of R is integral domain?
a) M(0,x,y,0)
b)M(x,0,0,y)
c)M(x,0,0,x)
d)M(x,y,y,z)
where M stands matrix of elements taken row by row.