Which of the following is used for creating user’s environment?#

• A. su
• B. su ‚Äö√Ñ√∂‚àö√ë‚àö¬®
• C. -su
• D. su ‚Äö√Ñ√∂‚àö√ë‚àö¬® ‚Äö√Ñ√∂‚àö√ë‚àö¬®