Core Concepts of Accounting Information Systems 12th Edition by Carolyn Strand Norman, Mark Simkin

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Within the context of databases, the term concurrency refers to the possibility that:
A) A customer of one store might also be a customer of another store
B) Two database users might want to access the same record at the same time
C) A credit entry for a customer requires a debit entry for a matching account
D) None of these