What is a recommended pattern that would minimize implementation time?

Universal Containers has a call center that would like to have a dashboard that updates in real time and shows information about phone calls that have been completed today (recorded in the Activity object). There are several teams in the call center, and each dashboard should only show calls from that team. An employee can start the board each morning, but after that no further user interaction should be needed.

What is a recommended pattern that would minimize implementation time?
A . Develop a Visaulforce page that uses the Steaming AP
C . Use Heroku to develop a dashboard page that uses the REST AP
E . Use native Salesforce dashboard functionality
F . Develop a Visualforce page that uses JavaScript Remoting.

Answer: A