Use the Graph Below to Find the Limits or Explain $\lim _{x \rightarrow 4^{-}} f(x)$

Essay

Use the graph below to find the limits or explain why the limits do not exist.
(a) $\lim _{x \rightarrow 4^{-}} f(x)$
(b) $\lim _{x \rightarrow 4^{+}} f(x)$
(c) $\lim _{x \rightarrow 4} f(x)$