Discussion
Assertion (A): Session affinity is best avoided where it can be.
Reason (R): It ties users to particular backends and so unbalances the pool and complicates scaling in.
Answer: C
Both are true and the reason gives both objections, and it also means the loss of one backend loses the sessions it was holding, so a restart during a rolling deploy logs those users out. Every deployment then becomes visible to users who were midway through a task.
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