Which one of the following functions is continuous at x = 3?
1
\({\rm{f}}\left( {\rm{x}} \right) = \left\{ {\begin{array}{*{20}{c}} 2&{{\rm{x}} = 3}\\ {{\rm{x}} - 1}&{{\rm{x}} > 3}\\ {\frac{{{\rm{x}} + 3}}{3}}&{{\rm{x}} < 3} \end{array}} \right.\)
2
\({\rm{f}}\left( {\rm{x}} \right) = \left\{ {\begin{array}{*{20}{c}} 4&{{\rm{x}} = 3}\\ {8 - {\rm{x}}}&{{\rm{x}} \ne 3} \end{array}} \right.\)
3
\({\rm{f}}\left( {\rm{x}} \right) = \left\{ {\begin{array}{*{20}{c}} {{\rm{x}} + 3}&{{\rm{x}} \le 3}\\ {{\rm{x}} - 4}&{{\rm{x}} > 3} \end{array}} \right.\)
4
\({\rm{f}}\left( {\rm{x}} \right) = \begin{array}{*{20}{c}} {\frac{1}{{{{\rm{x}}^3} - 27}}}&{{\rm{x}} \ne 3} \end{array}\)