Final answer:
The 'supports' relationship type is used to relate a Business Application to a Business Capability, indicating the enabling of a specific business capability by an application.
Step-by-step explanation:
The relationship type that should be used when relating a Business Application to a Business Capability is typically referred to as a 'supports' relationship. In the context of enterprise architecture, this type of relationship indicates that a particular business application is designed to enable or enhance a specific business capability.
For example, a customer relationship management (CRM) application supports the business capability of managing customer interactions and data.