Explanation
Configure the business unit data retention setting to 12 months is the policy that the Marketing Cloud admin could configure in Setup. Business unit data retention setting is a setting that allows marketers to specify how long records in data extensions should be retained at the business unit level. By configuring the business unit data retention setting to 12 months, any inactive data that is older than 12 months will be automatically deleted from the data extensions in that business unit2

Explanation
Marketing Cloud Email Marketing Manager and Marketing Cloud Regional or Local Administrator are two roles, custom or standard, that could be assigned to this user to meet the requirement. Marketing Cloud Email Marketing Manager is a standard role that grants access to Email Studio and its features, such as creating and sending emails, managing subscribers, and tracking email performance. Marketing Cloud Regional or Local Administrator is a custom role that grants access to all business units within a specific region or location, such as North America

Explanation
Data Filter, Template-based emails, and Automation Studio are the components that the customer's solution should include. Data Filter is used to segment a data extension based on specific criteria, such as the customer's expiration date. Template-based emails are used to create emails with predefined layouts and content blocks that can be easily customized by a general marketing user. Automation Studio is used to automate the email sends based on a schedule or a trigger