You have a raspberry pi connected to all the sensors and a code running to trigger if the sensors are triggered. Each sensor and keypad would run to a different input on the pi. They should al be able to be powered with a single cell lipo. Is that what you are asking?
Answer:
3 is true others are false
Another important advantage would be that the information you stored is portable and you may thus carry the CD right inside your pocket. Whenever you need it, you can retrieve it in a minute.
<span>A. Certificate of License</span>
