You have a Microsoft 365 E5 subscription that uses Microsoft Defender XDR and contains a user named User1.
You need to ensure that User1 can manage Microsoft Defender XDR custom detection rules and Endpoint security policies. The solution must follow the principle of least privilege.
Which role should you assign to User1?
The Security Administrator role is the most suitable for managing Microsoft Defender XDR custom detection rules and Endpoint security policies, while adhering to the principle of least privilege. This role has the necessary permissions to access and modify the needed settings within Microsoft Defender XDR and aligns with the responsibilities described in the context of the question.
Regarding "endpoint security policies", the role should be Security Admin, as per this link: https://learn.microsoft.com/en-us/defender-endpoint/mde-security-settings-management "The Endpoint Security Policies page in Microsoft Defender XDR is available only for users with the security administrator role in Microsoft Defender XDR. Any other user role, such as Security Reader, cannot access the portal. When a user has the required permissions to view policies in the Microsoft Defender portal, the data is presented based on Intune permissions. If the user is in scope for Intune role-based access control, it applies to the list of policies presented in the Microsoft Defender portal. We recommend granting security administrators with the Intune built-in role, "Endpoint Security Manager" to effectively align the level of permissions between Intune and Microsoft Defender XDR."
Security Admin because the operator can't change or modify anything only read
One of the following roles is required for Defender for Office 365 Manage alerts Security admin if its O365 then its Secuirty Admin
I think it should be B:Security Operator
https://learn.microsoft.com/en-us/defender-xdr/custom-roles
B. Security Operator