Reference:
https://docs.microsoft.com/en-us/microsoft-365/enterprise/about-microsoft-365-identity?view=o365-worldwide

Explanation
Graphical user interface, text, application, email Description automatically generated

Box 1: Yes
The MailItemsAccessed event is a mailbox auditing action and is triggered when mail data is accessed by mail protocols and mail clients.
Box 2: No
Basic Audit retains audit records for 90 days.
Advanced Audit retains all Exchange, SharePoint, and Azure Active Directory audit records for one year. This is accomplished by a default audit log retention policy that retains any audit record that contains the value of Exchange, SharePoint, or AzureActiveDirectory for the Workload property (which indicates the service in which the activity occurred) for one year.
Box 3: yes
Advanced Audit in Microsoft 365 provides high-bandwidth access to the Office 365 Management Activity API.

Explanation
Graphical user interface, text, application Description automatically generated

Box 1: Yes
You can use sensitivity labels to provide protection settings that include encryption of emails and documents to prevent unauthorized people from accessing this data.
Box 2: Yes
You can use sensitivity labels to mark the content when you use Office apps, by adding watermarks, headers, or footers to documents that have the label applied.
Box 3: Yes
You can use sensitivity labels to mark the content when you use Office apps, by adding headers, or footers to email that have the label applied.