\[ax+by++c=0\]does not represent an equation of line, if ____.

1.	\[ax+by++c=0\]does not represent an equation of line, if ____.
A.	\[a=c=0,b\ne 0\]
B.	\[b=c=0,a\ne 0\]
C.	\[a=b=0\]
D.	\[c=0,a\ne 0,b\ne 0\]
Answer» D. \[c=0,a\ne 0,b\ne 0\]

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\[ax+by++c=0\]does not represent an equation of line, if ____.

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