How the Delivery Company Should Spend his Money

The head of the delivery company should sue the money to buy a phone that can be used hands-free so the drivers can use it on the road without breaking the law and/or causing any accidents.  I suggest an IPhone or any touch-screen phone with a relatively large screen, loudspeaker OR the capability to connect to a special earpiece used for talking on the phone to the phone using bluetooth.
This will make the business more efficient because it means the drivers can contact anyone they need to at any time, in case there is a change of delivery (e.g. the customer doesn't want it, the item was wrong or damaged or the customer wants to change the order) or in an emergency (e.g. accidents, weather)

Main Differences between Bluetooth WiFi 3G and Infrared

Bluetooth is a system that phones use to send files to other phones.  Much like Streetpass/Spotpass on the 3DS, if you have bluetooth turned on on your phone and another person has bluetooth on on their phone and is close enough to you, you can send them files wirelessly without the use of the internet.

WiFi means Wireless Fidelity, and it is where a wireless internet connection is emitted from a box that is connected to the internet by broadband.  People can use the WiFi by connecting to it using a password (but in some cases, none is needed)

3G is similar to Bluetooth, except that it connects to the internet rather than to other phones.  It works mainly on IPads and Ipods and other Apple products.

Infrared is used in TV remotes and other controllers.  The TV/Console sends signals to the remote/controller and then they send commands back, to change channel or to make Kitana unleash a Fatality on Sub-Zero.

P4

The photographer could either use his WiFi to send his images to the computer by exchanging email addresses with whoever is printing the newspaper through email so they can put it in the newspaper, or he could use his phone by exchanging phone numbers so he can send/text the other person the image (or he could use a bluetooth function to send images to them)

How Protocols Protect Data

They protect data by-
Installing anti-virus software
Making password-protected software
Asking you for secret details (e.g. an answer to a question only you know) to help keep data safe
Easily available contact details in case any problems arise
Contacting linked accounts to let you know if any suspicious activity has been going on in your account without your consent
Notifying various services in case any problems do arise (e.g. administrators)