An administrator created a .env file in a user's 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?（）

• A、A shell other than ksh is being used by the user.
• B、The line 'export ENV=$HOME/.env' is missing from /etc/profile.
• C、The line 'export ENV=$HOME/.env' is missing from the user's .profile.
• D、The env_profile attribute is not defined for the user within /etc/security/user.