Which of the following is not true with regard to lock and key systems?

Which of the following is not true with regard to lock and key systems?
A . The locking system should be supplemented with other security devices.
B . Most key locks can be picked by an expert in a few minutes.
C . A high-quality pickproof lock is considered a positive bar to entry.
D . The lock is the most accepted and widely used security device of the basic safeguards in protecting installations.
E . Locks, regardless of quality or cost, should be considered as delay devices only.

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Answer: C