How does the team at Columbia University's flu-tracking tool work? A. The tool uses social media tracking to see how quickly the flu is spreading during a months time and assess its serverity

B. The tool uses flu data from previous years and mathematical formulas to track, and even predict, the spread of influenza like illnesses.

C. The tool shows the graphic spread of influenza in the united states during a week's time to show how quickly the flu is spreading.

D. The tool uses personal information manager applications to keep track of the people diagnosed with influenza like illnesses.