Which of the following would be considered as simple, relatively inexpensive, and easy to install?

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A magnetic reed switch is the simplest and cheapest option because it’s just a basic mechanical contact that closes when exposed to a magnetic field. Inside are two ferromagnetic reeds that touch to complete the circuit, so it needs almost no electronics or power to operate—just two wires. This makes installation very easy: you place the switch near a magnet, and the circuit closes without complex wiring or calibration.

In contrast, Hall effect sensors require a power supply and signal processing, making them more costly and involved to install. Optical switches need an emitter and detector with careful alignment and enclosure. Capacitive sensors rely on sensing changes in capacitance and can be influenced by environmental factors and require power and calibration. So, for a simple, inexpensive, and easy-to-install solution, the magnetic reed switch fits best.