A user executes the following command successfully:$ chmod +x file1.txt Which of the following is true of the output of this command?

• A. The command results in adding execute permission to the user who ran this command
• B. The command results in adding execute permission for the owner of the file
• C. The command results in an error since the file is not an executable file
• D. The command results in adding execute permission for all users (i.e., user,group & others)