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If the system of equations `x+2y+3z=3` `4x+3y-4z=4` `8x+4y-lambda z=9+mu` has infinitely many solutions,then the ordered pair `(lambda,mu)` is equal to

A

`(-(72)/(5),-(21)/(5))`

B

`((-72)/(5),(21)/(5))`

C

`((72)/(5),(21)/(5))`

D

`((72)/(5),-(21)/(5))`

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