Apple's iTunes is an example of what type of innovation?

A) continuous
B) service
C) breakthrough
D) product
E) accidental

Breakthrough

Refers to a significant and sudden advance or discovery that opens up new possibilities in a field of study, technology, or industry.

Continuous

An ongoing, uninterrupted process, action, or flow that does not have a clear beginning or end.

Product

Any item or service that is created through a process and is offered to the market to satisfy a need or want.