Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?

In Unix, the chmod command is used to change the permissions or protection mode of files or directories. The pattern emp[1-3] matches files starting with the string emp and ending with 1, 2, or 3.
By adding u+x to the chmod command, it grants execute permission to the owner of the file.
So, chmod u+x emp[1-3] is the correct command to change the protection mode of files starting with the string emp and ending with 1, 2, or 3.