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Answer 1 is correct pls explain

Which one of the following statements regarding the use or purpose of EJB QL is correct?
1. Every expression in EJB QL has a type.
2. Abstract schema types extend the superclass AbstractSchema allowing them to be saved to a database.
3. The cmr-fields of an entity bean's abstract schema type do not determine navigability, it is the '.' operator that determines navigability.
4. EJB QL is used for three types of query methods Finder methods, Seeker methods and Select methods.
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What is it you don't understand jhon? Why answer 1 is correct or why the other ones are wrong?

Note that all material for finding the answers can be found in the chapter 11 of the EJB spec 2.0.
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