How should a DevOps Engineer perform an AEM upgrade that preserves versions and workflows?

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How should a DevOps Engineer perform an AEM upgrade that preserves versions and workflows?
A . Put the updated AEM quickstart jar in the install folder and restart AEM in upgrade mode
B . Install the updated version of AEM using the package manager
C . Perform an in-place upgrade of the AEM instance
D . Set up a new AEM instance and copy the content with content packages

Answer: C