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HFEJB question 46 from mock exam

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I have a doubt regarding the following question from HFEJB.
What's true about an entity bean's primary key?
A Primary key fields must be cmp-fields
B Setter methods for fields associated with primary key must not be exposed thorugh client view
C If two entity objects have the same home and the same primary key, they are considered to be identical
D The getPrimaryKey() method can be invoked on references to only remote home interfaces, not local home interfaces

My answers were A,B, C

However the correct solution given are B & C.The reason given for A is that a compound key can be a primary key

I am unable to understand why A is a correct option, as the primary key is a subset of cmp fields.Even if a compound key is used, it needs to consist of cmp fields.Hence I had selected option A.

Can you please explain this?

Paresh Vernekar
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Check here.
Consider Paul's rocket mass heater.
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