⟩ Explain Which two of these best describe the implementation of a WAN Backupdesign over the Internet? (Choose two.)A. a best-effort methodB. requires no ISP coordination or involvementC. bandwidth guaranteed based on interface configurationD. designed as an alternative to a failed WAN connectionE. implemented with a point-to-point logical link using a Layer 2 tunnel
A.a best-effort method
D.designed as an alternative to a failed WAN connection