session related question in zend mock test for zend php 5 certification

Question: When implementing a permissions system for your Web site, what should always be done with regards to the session?

Answer:

1. None of the above
2. You should not implement permission systems using sessions
3. Sessions should be cleared of all data and re-populated
4. The session key should be regenerated

5. The session should be destroyed
See the book OpenCart 1.4 Template Design Cookbook.
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1. OpenCart 1.4 Template Design Cookbook.
2. Joomla Mobile Development Beginners Guide