Assigning a role to the business unit allows the admin to apply specific permission restrictions to all users in that business unit. The role defines what users can access and do within Marketing Cloud. The other options are not valid ways to accomplish this requirement.

The user in question holds roles that do not inherently include permissions to send emails. The roles assigned are:
Content Creator: Typically has permissions to create content but not necessarily to send emails.
Data Manager: Manages data but does not have email sending permissions.
Marketing Cloud Viewer: Can view campaigns and data but cannot execute or modify them.
To resolve this issue so that the user can send emails, the admin must: A. Edit permissions and Grant permissions to Send - This action involves customizing the user's permissions to include the ability to send emails. This can be done either by adjusting the permissions in one of the existing roles (if customization is possible and appropriate) or by creating a custom role or permission set that includes email sending capabilities.
References:
Salesforce Marketing Cloud Documentation on "Roles and Permissions"

In the scenario of managing data relationships for an eCommerce site:
B). Create a one-to-many relationship between Orders and Order_Details: This relationship allows multiple order details (such as individual items, quantities, and prices) to be associated with a single order, reflecting the typical structure of an eCommerce transaction.
D). Create a one-to-one relationship between Order_Details and Products: This relationship links each order detail line to a specific product, allowing for detailed tracking and analysis of product sales.
These relationships set up a logical and functional structure in Data Designer, enabling effective data management and utilization for reporting and customer insights.
Reference: Salesforce Help - Data Designer

For handling a daily file drop that requires immediate processing:
File Drop Automation: Use File Drop Automation triggered by the presence of a new file on the SFTP. This automatically starts the import and subsequent data handling processes.
Workflow Details: Start with an Import File Activity to load data into the staging data extension, followed by SQL Query Activity 1 to segment the data into one target data extension and SQL Query Activity 2 for the other.
Reference: Salesforce Marketing Cloud Automation Studio

To create a suppression list for hard-bounced email addresses, the most direct approach is to query the Bounce Data View in SQL. This Data View contains all bounce-related information, allowing admins to specifically filter for hard bounces by the bounce category. Using a query activity, the admin can extract all hard bounce records and create a dynamic or static suppression list based on these results. This method is efficient and ensures that only relevant data is included in the suppression list.
Reference: Salesforce Help - Querying Data Views for Bounce Information