Which factor is critical when designing an architecture to support both High Availability and Disaster Recovery for an online transaction processing system?

Which factor is critical when designing an architecture to support both High Availability and Disaster Recovery for an online transaction processing system?

(Choose Two)
A . Utilizing lightweight client-side scripts.
B . Implementing redundant power supplies.
C . Ensuring data synchronization across sites.
D . Choosing the latest software releases.

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Answer: BC