A and B are subsets of \(\mathbb{R}\). Every element x of A is mapped to an element of B by the rule \(y(x) =\left\{ {\begin{array}{*{20}{c}} {\frac{{5x}}{{(x -3)(x+3)}}}&{\text{if}~x \ne -1}\\ {-1}&{\text{if}~x = -1} \end{array}} \right.\) , then A =
1
\(\mathbb{R}\)/{-3, + 3, - 0}
2
\(\mathbb{R}\)/{-3, + 3}
3
\(\mathbb{R}\)/{-3, 3, 0, -1}
4
\(\mathbb{R}\)