Final answer:
Option (4), Radical service innovations typically include major innovations, start-up businesses, and the creation of new services for existing markets, leading to significant industry disruption.
Step-by-step explanation:
Radical service innovations typically comprise major innovations, establishment of start-up businesses, and the introduction of new services to markets that are already served. These elements of innovation can significantly disrupt industries by introducing groundbreaking ideas, products, or methods that challenge the status quo.
Examples of such innovations include technological advancements like smartphones, which have transformed communication, as well as services such as ride-sharing platforms that have revolutionized transportation.