If a seven-digit number made up of all distinct digits 8, 7, 6, 4, 2, $x$ and $y$ divisible by 3, then $\left(A\right)$ Maximum value of $x-y$ is $9$ $\left(B\right)$ Maximum value of $x+y$ is $12$ $\left(C\right)$ Minimum value of $xy$ is 0 $\left(D\right)$ Minimum value of $x+y$ is $3$

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