Detailed Instructions: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Q: Lyla Michaels: POTUS and SECDEF has taken us to Defcon -2 .
John Diggle: Just _ two _ ? They 're optimistic .
Lyla Michaels: They do n't want to cause a panic . The president asked me if the fate of the world is resting in the hands of an IT girl , a criminal , and two guys in Halloween costumes .
Oliver Queen: They 're not Halloween costumes .
A:
Defcon