To control telephony costs, management wants to restrict who can place long distance calls. Which two options allow for this restriction? (Choose two.)

A Calling Search Space (CSS) is assigned to a device or line and defines the ordered list of partitions that the device is permitted to search when placing a call, directly controlling which route patterns are reachable.

Partitions group route patterns together so that only devices whose CSS includes the appropriate partition can match and use those patterns, such as long distance route patterns.

Route groups are used to group gateways for redundancy and load balancing within a route list, not to restrict which users can place certain call types.

A SIP trunk is a signaling connection between CUCM and a remote system or PSTN gateway and does not provide per-user or per-device call restriction logic.

A gateway provides physical or logical connectivity to the PSTN but does not enforce which users are authorized to route calls through it.