You are a Microsoft 365 administrator for your company, where all users are assigned Microsoft 365 E3 licenses. The security team requests that a select group of users gain access to Microsoft Defender for Office 365 features to improve email security.
What is the most cost-effective way to fulfill this requirement?
Upgrade the base licenses of the specified users from Microsoft 365 E3 to Microsoft 365 E5
Purchase Microsoft Defender for Office 365 add-on licenses for the specified users
Purchase Microsoft 365 E5 licenses for all users
Enable Microsoft Defender for Office 365 features in the admin center without additional licenses