Slack compliance best practices state:

"Before configuring Slack for compliance, companies should meet with legal and compliance teams to set internal communication, retention, and monitoring policies tailored to regulatory requirements."

Implementing eDiscovery (D) is important later, but setting policies first ensures the correct technology choices. B and C may not align with regulatory needs without first setting clear policies.

(Reference: Slack Administration Study Guide - Compliance and Legal Alignment)

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