Frame relay and X.25 networks are part of which of the following?

A.
Circuit-switched services

B.
Cell-switched services

C.
Packet-switched services

D.
Dedicated digital services

Explanation:
Packet-Switched Technologies: X.25 Link Access Procedure-Balanced (LAPB) Frame Relay Switched
Multimegabit Data Service (SMDS) Asynchronous Transfer Mode (ATM) Voice over IP (VoIP)