Go back to 650-367 - PSACAS Advanced Collaboration Architecture Sales Specialist Exam

Question :-

Which Statement about migration to Cisco Unified Communications is true?
If something unexpected occurs, the phased migration provides a back-out plan that allows you to revert, with minimal effort, to the previous system, which is essentially still intact.
A phased migration is best suited for single- site deployments, whereas a parallel cutover is better for multisite deployments.
A phased migration allows you to revert, with minimal effort, to the previous system.
A phased migration purchases individual components of the system as and when they are needed.

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