Discussion
It is better to use files than a DBMS when there are
Answer: B
Correct answer: Stringent real-time requirements
A DBMS adds layers - query processing, locking, logging - and with them latency that is hard to bound. Where an application must guarantee a response within a few microseconds, direct file access is more predictable. The other two options are arguments for a DBMS, not against: concurrent access and complex relationships are exactly what it exists to manage.
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