You determine that a certain user, user1, is using excessive disk space in his home directory. To achieve the best space reduction with minimum effort, you want to gather information to help user1…

You determine that a certain user, user1, is using excessive disk space in his home directory. To achieve the best space reduction with minimum effort, you want to gather information to help user1 decide which files or directories to back up. You also want to illustrate that user1 is using more space than others. Which two commands achieve this? (Choose two.)