A Consul operator is performing a rolling upgrade of a five-node Consul server cluster from version 1.14 to 1.15. According to HashiCorp's upgrade guidance, what is the recommended approach to minimize risk?

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C. Upgrade follower nodes one at a time, then upgrade the leader last. HashiCorp's recommended Consul upgrade procedure is to upgrade follower (non-leader) servers one at a time, verifying cluster health after each upgrade, and then upgrading the leader last. Upgrading the leader last avoids unnecessary leader elections during the upgrade and maintains quorum throughout. Option a is wrong because upgrading all nodes simultaneously risks simultaneous downtime and loss of quorum.

A Consul operator is performing a rolling upgrade of a five-node Consul server cluster from version 1.14 to 1.15. According to HashiCorp's upgrade guidance, what is the recommended approach to minimize risk?

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