Prevent Downloading and Opening Malware-Infected Files in Microsoft Teams Channels

C.

The correct answer is A. From the Microsoft 365 Compliance admin center, create a data loss prevention (DLP) policy.

Enabling guest access for Microsoft Teams allows external users to collaborate with internal users in Teams channels. However, it also opens up the possibility of malware being introduced into the organization's environment through file sharing.

To prevent users from downloading and opening files that contain malware by using Microsoft Teams channels, you need to create a data loss prevention (DLP) policy. A DLP policy is a set of rules that define and enforce regulations around how data can be used and shared within an organization.

By creating a DLP policy, you can set conditions that restrict certain types of files from being shared in Teams channels. For example, you can configure the policy to block files that contain malware, or files with certain file extensions that are known to be used for malware.

Option B, enabling the End user protection baseline policy in the Azure Active Directory admin center, is not relevant to preventing malware in Teams channels. The End user protection baseline policy is a security feature that enforces multi-factor authentication, password protection, and other security settings for user accounts.

Option C, turning on Defender for Office 365 for SharePoint, OneDrive, and Microsoft Teams, is also not the correct answer. While Defender for Office 365 is a powerful security tool, it is not designed specifically to prevent malware in Teams channels.

Option D, adding an identity provider in the Azure Active Directory admin center, is also not the correct answer. An identity provider is a service that manages user authentication and authorization. While this is an important part of overall security, it does not address the specific issue of preventing malware in Teams channels.