For what value of $a$ is the following function continuous at every $x?f(x)=\{\begin{array}{cc}{a}^{2}x-6a,& x2\\ 8,& x<mn\; id="EditorElement\_522118">2</mn>\end{array}$ Select the correct choice below and, if necessary, fill in the answer box to complete your choic A$.a=($Use a comma to separate answers as needed.$)$ B$.$ There is no solution.