An organization called Ranbaxy Inc. has currently 3 divisions in 3 different locations within Sydney city. One of the divisions serves as the company headquarters. They hire you as a network consultant to recommend a networking plan. The following are the requirements outlined by the company's CTO:

• Large volumes of data need to be exchanged between the divisions but only during certain times (random-not known a priori) during the day.
• The organization has a sizeable pool of employees who will need to regularly access their networks resources from home.
• Mobile sales personnel require access to their respective branch networks to upload/download sales data from remote locations.
• Since the data exchanged between the divisions is critical, privacy is of utmost concern.
• There is a budgetary constraint that will force the manager to go for the cheapest and most viable solution.

What type of WAN solution would you recommend and why? Provide adequate justification in support of your solution. (400 words)