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Consider the system of equation `x+y+z=1, 2x+3y+2z=1, 2x+3y+(a^(2)-1)z=a+1` then (a) system has a unique solution for `|a|=sqrt(3)` (b) system is inconsistence for `|a|=sqrt(3)` (c) system is inconsistence for `a=4` (d) system is inconsistence for `a=3`

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