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IBM 158 Question????

 
Greenhorn
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The answer of the following question maybe is d. Could anybody give me some explanation? Thanks!!
When designing a primary key generator for your J2EE application, which of the following would be the BEST option?
a) Depend on database specific key generation support, accessible through stored procedure
b) Build custom key generation engine deployed to database, accessible through stored procedure
c) Use a local primary key generation algorithm to eliminate synchronization delays
d) Use local management and delivery of centrally generated primary keys
Single Select - Please select the best answer (one and only one choice must be selected).
 
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