Marketing Cloud admin is asked to determine the total number of emails sent across all of their business units in the last calendar year Where would the admin retrieve this information?

A customer with limited technical resources has requested assistance in setting up a small emaildeployment that the customer will maintain long term. The email will display men's shoes to males in the audience and women's shoes to females in the audience. The sendable data extension contains a field with a value of Male or Female. Which method shoulda consultant recommended to ensure content is displayed properly within the email.

A Marketing Cloud Administrator noticed a File DropAutomation has been falling on the Import File activity.
The automation is configured with a filename pattern, so the filename is expected to begin with customer import_. The import is configured to look for a file named Customer import %%Year%%%% Month%%%%Day%%.csv, however, the admin notices the filenames Include seconds and milliseconds what should the admin do to fix the issue?

Northern Trail Outfitters has Imported a file Into All Subscribers. They then received a results file stating [email protected] could NOT be imported.
Which error code would the file contain for this record?

An email marketing manager is planning to send a promotional email to one million subscribers.
Which data structure should be used?