To answer this question, you need to understand the concept of ISDN Basic Rate Interface (BRI) connections and how they can be connected to other interfaces on a router.
Option A) RJ-11 cable - This option is incorrect because an RJ-11 cable is typically used for connecting telephones or modems to a telephone line, not for connecting ISDN BRI connections to other interfaces on a router.
Option B) Cat 5 - This option is incorrect because Cat 5 cables are commonly used for Ethernet connections, not for connecting ISDN BRI connections to other interfaces on a router.
Option C) ISDN terminal adapter - This option is correct. An ISDN terminal adapter is a device used to connect ISDN BRI connections to other interfaces, such as EIA/TIA-232, on a router. It acts as an intermediary between the ISDN network and the router, converting the BRI signals to a format that the router can understand.
Option D) ISDN power adapter - This option is incorrect because an ISDN power adapter is used to provide power to an ISDN device, such as an ISDN terminal adapter, but it does not directly connect ISDN BRI connections to other interfaces on a router.
The correct answer is C) ISDN terminal adapter. This option is correct because an ISDN terminal adapter is specifically designed to connect ISDN BRI connections to other interfaces on a router.