Which three disconnect methods can be configured to fix this problem?

A user is troubleshooting an FXO line on a Cisco IOS router that remains connected even after the call ends. Which three disconnect methods can be configured to fix this problem? (Choose three)
A. Loop Current Feed Open Signaling Disconnect
B. Hookflash Duration Signaling Disconnect
C. CP-TONE Dual Supervisory Disconnect
D. Power Denial-based Supervisory Disconnect
E. Ground-start Signaling Disconnect
F. Tone-based Supervisory Disconnect

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