Under which of the following condition(s...

Under which of the following condition(s) does (do) the system of equations `[(1,2,4),(2,1,2),(1,2,(a-4))] [(x),(y),(z)]= [(6),(4),(a)]` possesses unique solution?

A

` a in R`

B

`a= 8`

C

for all integral values of a

D

`a ne 8`

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