B is correct.
In the training material:
Technical services are published to service owners and typically underpin one or more business or application services. Dynamic CI Groups are technical services populated with a relationship to a CMDB group. It is a dynamic grouping of CIs based on common criteria like all Oracle databases in North America.
You can see service maps like this on the Operator Workspace
dashboard. Later in this tutorial, you will learn about the dashboard and
what an application service looks like when an alert is associated with a
CI.
Types of application services
Event Management classifies application services into the following
types:
Technical services
A technical service is a dynamic grouping of CIs based on some
common criteria. For example, a technical service could be comprised
of all web servers or all Oracle databases for a specific location, like
North America.
Application services
An application service can consist of discovered services, manual
services, or both. A discovered service is an application service
that the Service Mapping application finds (if your organization uses
Service Mapping). A manual service is an application service that your
administrator configures by selecting and adding each CI and specifying
the relationships between CIs.
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