For NTO to format links for Google Analytics 360 without including PII, they should use non-personally identifiable information in the query string parameters. Suitable options include:
* A. Product Code: Identifies a product without revealing customer identity.
* B. Application ID: An internal reference that does not disclose personal details.
* C. Subscriber ID: A unique identifier for a subscriber that is not directly tied to personal details like an email or name.

When creating custom roles in Marketing Cloud, it's important to consider that:
B). Custom roles are only available within the business unit in which they were created. This means that the scope of the custom roles is limited to the specific business unit, and they do not automatically apply to other business units within the same Marketing Cloud account.
Reference: Salesforce Help - Custom Roles

Explanation
The Content Builder Settings under Setup allow the admin to create a default Header and Footer for emails.
These settings apply to emails created in Content Builder only. The other settings do not have an option to create a default Header and Footer for emails.

The best solution to reduce manual workloads and improve customer experience for Northern Trail Outfitters, given the increase in customer purchases, is to implement D. A triggered message to send an email as soon as a customer completes a purchase. This approach automates the process of sending order confirmations and ensures that customers receive timely and relevant communications immediately after their purchase, enhancing their experience and reducing the workload on the team.