For the system of linear equations $2 x+4 y+2 a z=b$ $x+2 y+3 z=4$ $2 x-5 y+2 z=8$ which of the following is NOT correct?

Question

For the system of linear equations

$2 x+4 y+2 a z=b$

$x+2 y+3 z=4$

$2 x-5 y+2 z=8$

which of the following is NOT correct?

It has infinitely many solutions if $a=3, b=8$

It has infinitely many solutions if $a=3, b=6$

It has unique solution if $a=b=8$

It has unique solution if $a=b=6$

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