Question

what are t carriers? a dedicated digital telephone lines used in europe b the data channels in an isdn line c dedicated digital telephone lines used in north america d the signaling channels in an isdn line

Explanation:

T - carriers are dedicated digital telephone lines, and they are used in North America. Option A is incorrect as they are not used in Europe (E - carriers are for Europe). Option B is wrong because B channels in ISDN are data channels, not T - carriers. Option D is wrong as signaling channels in ISDN are D channels, not T - carriers. So the correct option is C.

Answer:

C. Dedicated digital telephone lines used in North America