When would it be more efficient to use SMB to transfer files instead of FTP?

Question:
When would it be more efficient to use SMB to transfer files instead of FTP?

• when downloading large files with a variety of formats from different servers
• when a peer-to-peer application is required
• when the host devices on the network use the Windows operating system
• when downloading large numbers of files from the same server
• when uploading the same file to multiple remote servers

Exam with this question: CCNA 1 (v5.1 + v6.0) Chapter 10 Exam Answers