(a) Find all values of x where the function is discontinuous, (b) find the limit from the left and the right at any values of x where the function is discontinuous, and (c) graph the given function.\
\begin{equation*} g(x) = \begin{cases} 13 & \text{if } x < -1\\ x^2 + 4 & \text{if } -1 \le x \le 3\\ 13 & \text{if } x > 3 \end{cases} \end{equation*} (a) Select the correct choice below and, if necessary, fill in the answer box to complete your choice.\
A. The function is discontinuous at x = \\
(Use a comma to separate answers as needed.)\
B. The function is continuous for all values of x.