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HF EJB mock exam problem (page 168)

 
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Hi!
For question 3 on page 168, can someone explain why option D is correct?
The question mentions that R is a remote client of B, but R can be another bean, right? So why B cannot invoke method on it?
Thanks.
 
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https://coderanch.com/t/158671/java-EJB-SCBCD/certification/page
 
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its as simple as R has the home object of B because R is the client of B and B does not have the home object of R since no where it is told that B is the client of R.
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