Which two items can be included in the design to offer high availability?

A corporation has asked for a new design of a branch office consisting of 50 workers and 30 phones that need continual connectivity.

Which two items can be included in the design to offer high availability? (Choose two.)
A . backup configuration of branch router
B . backup configuration of corporate router
C . single uplink to WAN
D . dual uplinks to WAN
E . always be on the most up-to-date router code

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Answer: AD