$(10$ marks$)$ The concept of Cloud Computing is decades old, but has only been truly embraced in recent years. Discuss the reasons why this recent adoption of Cloud Computing occurred.

$8.$ You are designing a security system based on off$-$the$-$shelf parts in combination with Raspberry PIs. You have three Raspberry PIs $($RPi$)$ at your disposal, each equipped with a good camera, fully connected via a WiFi network.

The following command will take a picture at a given resolution, compress it using jpeg compression and store it at as web$-$cam$-$shot.jpg in the current working directory:

$ fswebcam $-$r $1024$x$768--$jpeg $85-$D $1$ web$-$cam$-$shot. jpg

Besides the cameras, you also have access to all kinds of security peripherals of your choice $($motion sensors$,$ door switches, etc.$).$

$($a$)(8$ marks$)$ Explain in detail how you would go about setting up the three Raspberry Pis to detect intruders and how the user can be notified of the situation. Use diagrams, pseudo$-$code and mention any technology that can be considered$/$researched enhance the security configuration above.

$($b$)(8$ marks$)$ You are concerned that the Raspberry Pis could be compromised $($i$.$e$.$ stolen$/$damaged$)$ or may just stop working. Explain how you can build a sub$-$system between the three units to ensure that they keep working.

$($c$)(2$ marks$)$ Finally, you want each Raspberry Pi to also monitor other locations $($doors$,$ windows, etc.$)$ that the camera is not covering. Using motion detection, pressure switches, etc. explain how the the Raspberry Pi can interact with these.