Which of the following chmod commands can Robert use in order to achieve his objective?

Robert is a network admin in XYZ Inc. He deployed a Linux server in his enterprise network and wanted to share some critical and sensitive files that are present in the Linux server with his subordinates. He wants to set the file access permissions using chmod command in such a way that his subordinates can only read/view the files but cannot edit or delete the files.

Which of the following chmod commands can Robert use in order to achieve his objective?
A . chmod 666
B . chmod 644
C . chmod 755
D . chmod 777

Answer: B