The function \(f\left( x \right) = \;\left\{ {\begin{array}{*{20}{c}} {{e^{\frac{1}{x}}}\;\;;x \ne 0}\\ {0\;\;\;\;\;;x = 0} \end{array}} \right.\;\) has
1
Removable discontinuity at x = 0
2
Irremovable discontinuity at x = 0
3
Continuity at x = 0
4
None of the above