Which of the following is a key characteristic of Mashup Links?

A key characteristic of Mashup Links is that they take users to an external system. This is integral to the concept of a mashup, where data or functionality from multiple sources is combined to create a cohesive user experience. When using Mashup Links, the primary function is to facilitate navigation to external applications or services, allowing users to leverage additional capabilities or information that may not reside within the primary application.

While options related to synchronous loading, exclusive reliance on REST APIs, or required user logins may describe other technological aspects or implementation specifics, they do not capture the fundamental purpose of Mashup Links, which is to direct users to external systems. This focus on integration through navigation to external resources is what defines the utility and functionality of Mashup Links in an integrated environment.