You want to copy a file named "report.txt" to a directory called "Backup." Which command should you use?

Q: You want to copy a file named "report.txt" to a directory called "Backup." Which command should you use?    

• `cp report.txt Backup`
•  `grep report.txt Backup`    
• `rm report.txt Backup`    
• `mv report.txt Backup`