Emerging technologies used for better network survivability include SONET and ATM.What does SONET…

Emerging technologies used for better network survivability include SONET and ATM.What does SONET and ATM stand for?
A. Synchronous On-line Network and Asynchronous Transfer Machine.B. Synchronous Optical Network and Asynchronous Transfer Mode.C. System Operator Network and Automated Timing Machine.D. None of the above.