You're an Org Admin working at a financial services organization.

According to Slack's Enterprise Mobility Management (EMM) documentation:

"EMM allows organizations to restrict access to Slack only from approved (managed) mobile devices, enhancing security and ensuring compliance with corporate policies."

Requiring minimum app versions (A), blocking downloads (C), and requiring secondary authentication (D) are native Slack security settings or can be handled with mobile session settings — but device restriction is specifically an EMM capability.

(Reference: Slack Administration Study Guide - Enterprise Mobility Management (EMM) Overview)

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