What characteristic makes an innovation a "Disruptive Innovation" as carefully defined by Clayton Christensen instead of an example of Schumpeter's "Creative Destruction?"

A Disruptive Innovation enters the market place and immediately disrupts the existing markets.

A Disruptive Innovation has a clearly better technology than has ever been available before.

A Disruptive Innovation does not look like a serious competitor to existing products $-$until it is too late.

A Disruptive Innovation is any innovation that is disruptive.