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new question of ejb exam

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Hi guys:
could you read following question:

which of the following are possibly valid tages in defining the type of a CMR field in a deployment descriptor?

a. <cmr-field-type>java.util.List</cmr-field-type>
b. <cmr-field-type>java.util.Map</cmr-field-type>
c. <cmr-field-type>java.util.Collection</cmr-field-type>
d. <cmr-field-type>java.util.Set</cmr-field-type>
e. <cmr-field>java.util.Collection</cmr-field>

I want to know why "a" is not correct answer?
thank you!
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