An organization's IT department wants to provide advanced security features to specific users beyond what is included in their current Microsoft 365 E3 licenses. What is the most cost-effective way to provide these additional features to those users?
Upgrade certain users from Microsoft 365 E3 to Microsoft 365 E5 licenses
Purchase standalone licenses for the additional features and assign them to selected users
Assign additional Microsoft 365 E3 licenses to the users needing the features
Purchase and assign add-on licenses to the specific users needing the features