What can be used to join two data extensions to segment via Drag and Drop Segmentation?

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) just hired a new associate who is brand new to email marketing to start creating and deploying the company's monthly campaigns. NTO wants to ensure no mistakes are made.
Which two elements of the send can be reviewed with Approvals?
Choose 2 answers

Northern Trail Outfitters is using a Smart Capture form in CloudPages to capture contest registrations in a data extension. Corporate has requested a nightly file with all registrants in this data extension be sent daily from Marketing Cloud to an external SFTP.
Which automation configuration should be used?

Northern Trail Outfitters wants to create a welcome series that changes based on subscriber behavior.
Subscribers will be sent down a predetermined path depending on whether they click on the second email or not.
Which Journey Builder activity should be used?