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Two systems with impulse responses  $h_{1}(t)$ and $h_{2}(t)$ are connected in cascade. Then the overall impulse response of the cascaded system is given by

1.  product of  $h_{1}(t)$ and $h_{2}(t)$
2.  sum of $h_{1}(t)$ and $h_{2}(t)$
3. convolution of  $h_{1}(t)$ and $h_{2}(t)$
4.  subtraction of $h_{2}(t)$ from $h_{1}(t)$