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Which of these following sensor is a useful as part of a burglar alarm system for commercial buildings?

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Which of these following sensor is a useful as part of a burglar alarm system for commercial buildings?

(a) Movement detector

(b) Door sensor

(c) Window sensor

(d) All of the mentioned

This question was addressed to me in quiz.

The origin of the question is Architectural Patterns in division Architectural Design of Software Engineering

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The correct option is (d) All of the mentioned

For explanation I would say: A burglar alarm system for commercial buildings include movement detectors in individual rooms, door sensors that detect corridor doors opening, and window sensors on ground-floor windows that can detect when a window has been opened.

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