单项选择题

Questions 25 and 26 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
What happened to Lockheed Martin after the cyber-attack

A.Most of its programmes had been compromised.
B.The impact on Pentagon was serious.
C.No customer and employee personal data were compromised.
D.The threat was not detecte