The most widely used security device is:

Question

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Lock-and-key devices are the most commonly used security devices, and also the most effective in preventing unauthorized access. They are relatively inexpensive and easy to install and operate. However, the effectiveness of the lock-and-key device depends on the quality of the lock and the key control program in place. Other security devices such as alarm systems, CCTV, and protective lighting can complement the lock-and-key device, but they cannot replace it as the primary means of securing a facility. Fences are also important, but they are not practical for all types of facilities or situations.

The Most Widely Used Security Device Is