Which 3 options are available to create a template in marketing cloud? Choose 3

A file is received daily from a data provider to the account SFTP. This file needs to be imported into Marketing Cloud as soon as it arrives. The arrival time of this file varies by several hours from day to day.
What tools should be used to accomplish this?

Northern Trail Outfitters would like to use a File Drop Starting Source in Automation Studio to send shipping
tracking emails when orders are dispatched. A delimited text file containing all the data for the send will be
uploaded to a designated directory on the Enhanced SFTP Account, and the email should be sent to
customers when the file transfer has completed.
What is the correct sequence of Activities for this File Drop Starting Source?

Northern Trail Outfitters (NTO) would like to target members who recently received and opened any promotional email with the subject line "NTO Spring Sale."
What feature should be used to target these members?

A marketing team is using two systems to send emails. The team wants to maintain unsubscribe information between both of the systems. In order to remain compliant, they would like to update Marketing Cloud subscription status weekly based on unsubscribes from the other system.
Which solution should they use to maintain subscriber status?