4. The figure below shows the graph of a function \( f \) with domain \( 0 \leq x < 6 \). Which of the following statements are true?
- \( \lim\limits_{{x \to 4^-}} f(x) \; exists. \)
- \( \lim\limits_{{x \to 4^+}} f(x) \; exists. \)
- \( \lim\limits_{{x \to 4}} f(x) \; exists. \)
