What is the correct sequence of Activities for this File Drop Starting Source?

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?
A . Import File Activity > Send Email
B. Import File Activity > File Transfer Activity > Send Email
C. File Transfer Activity > Send Email
D. File Transfer Activity > Import File Activity > Send Email

Answer: D