destroying session varriables

Question:

To destroy one variable within a PHP session you should use which method in PHP 5?

Answer:

1. Unset the variable in $HTTP_SESSION_VARS
2. Use the session_destroy() function
this function destroy all session varriable in the current session. but not unregister them.
3. Use the session_unset() function
this will unregister all the session varriables.
4. unset the variable in $_SESSION using unset()
this will unregister the session varriable.
5. Any of the above are acceptable in PHP 5
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