Which three configurations will meet their requirement for telephony redundancy and survivability?

You are working with a customer that has 4,000 employees in 4 locations. Singapore houses the main data center and Sidney houses the backup data center they have branch locations in Los Angeles and Denver. They are asking for geographic redundancy for telephony functionality. They want local survivability at their branch locations for telephony functionality.

Which three configurations will meet their requirement for telephony redundancy and survivability? (Choose three)
A . Survivable remote CM instances deployed in Los Angeles and Denver
B . One duplex pair CM servers deployed as a survivable Core in Los Angeles
C . One duplex pair of CM servers deployed as the active CM instance in Singapore
D . Survivable remote CM instances deployed in Singapore and Sydney
E . One duplex pair CM servers deployed as a survivable Core in Sydney

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Answer: ACE