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Aria has two pet snakes, Mian and Udon. The combined length of the two snakes is $34$ inches, and Udon is $12$ inches shorter than Mian. Which of the following systems of equations could be used to find $m$, the length of Mian in inches, and $u$, the length of Udon in inches?$\newline$Choose $1$ answer:$\newline$(A) $m+u=12$$\newline$$m-u=34$$\newline$(B) $m+u=12$$\newline$$u-m=34$$\newline$(C) $m+u=34$$\newline$$m-u=12$$\newline$(D) $m+u=34$$\newline$$u-m=12$