When is an incumbent sustaining technology most likely to be threatened by a disruptive technology? 1) When the disruptive technological innovation first occurs 2) When the incumbent technology satisfies the performance demanded by the market 3) When the incumbent technology exceeds the performance demanded by the high end of the market 4) When the disruptive technological innovation exceeds the performance demanded by the high end of the market 5) When the incumbent technology exceeds the performance demanded by the low end of the market