Philips Sonicare recently introduced the DiamondClean rechargeable toothbrush. A key innovation is its "Quadpacer" interval timer that goes off after 30-seconds to prompt the user to move on to the next quadrant of the mouth that results in better cleaning and improved gum health. This is an example of which type of innovation?

A. dynamically continuous innovation.
B. continuous innovation.
C. discontinuous innovation.
D. disparate innovation.
E. evolutionary innovation