The given impulse response h(n) of the LTI system is stable when _______.
\(h\left( n \right) = \left\{ {\begin{array}{*{20}{c}} {{a^n},\;\;\;n < 0}\\ {{b^n},\;\;\;n\; \ge 0} \end{array}} \right.\)
1
|a| > 1 and |b| > 1
2
|a| < 1 and |b| < 1
3
|a| < 1 and |b| > 1
4
|a| > 1 and |b| < 1