If the function \(f\left( x \right) = \left\{ {\begin{array}{*{20}{c}} {a{x^2} - b,}&{\left| x \right| < 1}\\ { - \frac{1}{{\left| x \right|}},}&{\left| x \right| \ge 1} \end{array}} \right.\) is differentiable, then the values of a and b are respectively:
1
1, 2
2
0.5, 1.5
3
0.5, 0.5
4
1, -1