How Was the NSA Involved in Deterring Terrorism So Effectively

How was the NSA involved in deterring terrorism so effectively in the Obama Administration?

A) The NSA had been spying and data mining on virtually everyone with a program called Prism.
B) The Obama administration has asked the NSA and CIA to work together to combat terrorism - an unlikely partnership that has had impressive results.
C) The NSA actually came up with the drone program to eliminate terrorism.
D) President Obama gave much of the DHS and DNI authority to the NSA, who now leads antiterrorism and counter-terrorism efforts.