Which two elements of a dial plan define the domains that are accessible and are assigned to an endpoint? (Choose two.)

Call Admissions Control (CAC) is used to limit the number of active calls over a WAN link to prevent congestion, not to define accessible dial plan domains.

Route patterns define how specific number patterns are routed out of the CUCM cluster, but they are contained within partitions and accessed by Calling Search Spaces, not the elements that define accessibility domains themselves.

A Calling Search Space (CSS) is an ordered list of partitions that defines the "scope" of numbers an endpoint (like a phone or gateway) can dial. It determines which call routes, directory numbers, or features an endpoint can reach.

Translation patterns modify dialed numbers before routing but, like route patterns, they are contained within partitions and accessed by Calling Search Spaces, serving a specific function within a domain, not defining the domain itself.

A Partition is a logical grouping of numbers (such as Directory Numbers, Route Patterns, or Translation Patterns) within the Cisco Unified Communications Manager dial plan. Assigning partitions to Calling Search Spaces controls access to these numbers, effectively defining accessible "domains."