$2$

Find the given limit$.$

$\underset{x{9}^{+}}{lim}\sqrt[\phantom{2}]{x^2-81}$

Select the correct choice below and, if necessary, fill in the answer box to complete

A$.\underset{x{9}^{+}}{lim}\sqrt[\phantom{2}]{x^2-81}=$

B$.$ The limit does not exist and is not $$ or $-.$

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