What do Trinoo, TFN2k, WinTrinoo, T-Sight, and Stracheldraht have in common?

What do Trinoo, TFN2k, WinTrinoo, T-Sight, and Stracheldraht have in common?
A . All are hacking tools developed by the legion of doom
B . All are tools that can be used not only by hackers, but also security personnel
C . All are DDOS tools
D . All are tools that are only effective against Windows
E . All are tools that are only effective against Linux

Answer: C