单项选择题 Which command will configure a directory /commonfiles so that a user cannot delete files owned by other users in the same group?（）

单项选择题 An administrator created a .env file in a users home directory to configure a number of custom environment variables for a local application. However, after the user logs out and then logs back into the system, the custom variables are not being set. What is the most likely reason that the custom .env file is being ignored?（）

单项选择题 Which install method should be used to recycle an LPAR without retaining any information from its original configuration?（）