What is the main purpose for holding such a special contest？A．To encourage hackers to atta

What is the main purpose for holding such a special contest？

A．To encourage hackers to attack big companies.

B．To knock some unsecured websites offline.

C．To get some analysis data for preventing attacks.

D．To prove hacker"s professional skills on computer.

请帮忙给出正确答案和分析，谢谢！