In ATM networks, SVCs: Select two.

A.
Need more overhead for setup than PVCs

B.
Need less overhead for setup than PVCs

C.
Use fixed end-to-end VPI/VCI pairs

D.
Are automatically set up upon request by an end user device

Explanation:
An SVC is created and released dynamically and remains in use only as long as data is being transferred. In this way it is similar to a telephone call. Dynamic call control requires a signaling protocol between the ATM endpoint and the ATM switch. SVCs provide connection flexibility and call setup that can be automatically handled by a networking device. Setting up the connection requires extra time and overhead.