Explanation:

Step 1 - Scenario
The requirement is to ensure Microsoft Purview Insider Risk Management can collect signals when a user copies files to a USB device using their default browser. The devices differ by browser type:
Device1 # Default browser = Microsoft Edge
Device2 # Default browser = Google Chrome
Step 2 - Signal collection methods in Insider Risk Management
Insider Risk Management uses Microsoft Purview Information Protection client and Purview browser extensions to collect activity signals.
For Microsoft Edge (Chromium-based), insider risk signals are collected via the Microsoft Purview Information Protection client.
For Google Chrome, signals are collected through the Microsoft Purview extension (available in the Chrome Web Store).
The Microsoft Defender Browser Protection extension is for web protection against malicious sites, not for insider risk activity signals, so it is irrelevant here.
Step 3 - Microsoft Reference
Microsoft documentation:
"For insider risk signals collection in Microsoft Edge, the Microsoft Purview client must be deployed. For Google Chrome, the Microsoft Purview extension is required." Reference: Insider risk management activity signals

Adding a folder path to the file path exclusions in Microsoft 365 Endpoint DLP does not prevent Tailspin_scanner.exe from accessing protected sensitive information. Instead, it would exclude those files from DLP protection, which is not the intended outcome.
To block Tailspin_scanner.exe from accessing sensitive documents while allowing it to access other files, the correct solution is to use Microsoft Purview Endpoint Data Loss Prevention (Endpoint DLP) and add Tailspin_scanner.exe to the Restricted Apps list.
Endpoint DLP allows you to block specific applications from accessing sensitive files while keeping general access available. Restricted Apps List in Endpoint DLP ensures that Tailspin_scanner.exe cannot open, copy, or process protected documents, but it can still function normally for non-sensitive content.

Explanation:

Step 1 - Requirement
You want to create a custom sensitive info type named Sensitive1.
This SIT will be created from a document fingerprint of Template1.docx.
You then want to use Sensitive1 in DLP policies.
Step 2 - Where do you create custom Sensitive Info Types?
Custom SITs (including document fingerprinting) can only be created in the Microsoft Purview compliance portal.
They cannot be created in the Exchange admin center, SharePoint admin center, or directly in PowerShell.
Answer for creation: The Microsoft Purview portal
Reference: Create a custom sensitive information type with document fingerprinting Step 3 - Where can custom Sensitive Info Types be used?
Once created, custom SITs are tenant-wide and can be used across all workloads that support DLP:
Exchange email
SharePoint Online sites
OneDrive
Teams chat and channel messages
In the table, the DLP policies are:
DLP1 # Exchange Online email
DLP2 # SharePoint Online sites
DLP3 # Teams chat and channel messages
Since Sensitive1 is a custom SIT, it can be used in all three policies.
Answer for usage: DLP1, DLP2, and DLP3

Explanation:

User1 can delete File1 on March 10, 2023.
No - File1 has Retention1 applied, which retains it for 4 years with a "Retain only" action. This means it cannot be deleted during the retention period, which ends on March 1, 2027.
User2 can delete File1 on March 10, 2027.
No - User2 is a Member and does not have the Owner role, which is required to delete files under retention policies during the retention period. Additionally, the "Retain only" action prevents deletion until the retention period ends on March 1, 2027.
User2 can edit File2 on March 15, 2025.
No - File2 has Retention2 applied, which retains it for 2 years with a "Retain and delete" action. This means the file is protected from edits or deletions during the retention period, which ends on March 1, 2025. Since March 15, 2025, is after the retention period, the file would be eligible for deletion, but the question specifies editing, which is restricted during the retention period.