Given that $g(x)=\frac{x-7}{x+4},$ find each of the following. a$)g(8)$ b$)g(7)$ c$)g(-4)$ a$)$ Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A$.g(8)=($Simplify your answer.$)$ B$.g(B)$ does not exist. C$.g(8)$ is not a real number. b$)$ Select the correct choice below and, if necessary, fill in the answer box to complete your cholce. A$.g(7)=($Simplify your answer.$)$ B$.9(7)$ does not exist. C$.g(7)$ is not a real number. c$)$