单选题Which item is the most important factor during deployment of high-availability features？（）ATest major changes before deployment and defer minor changes until during deployment. BDocument and verify rollback procedures.CEnsure consistency of code versions across the network.DProgressively modify procedures and documentation during implementation.
单选题
Which item is the most important factor during deployment of high-availability features？（）
A
Test major changes before deployment and defer minor changes until during deployment.
B
Document and verify rollback procedures.
C
Ensure consistency of code versions across the network.
D
Progressively modify procedures and documentation during implementation.
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