Questions 6 and 7 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the question. Now listen to the news. According to the news, who claimed responsibility for the rocket attack

A．There are two groups of engineers who are working on the alternative solutions of the program.
B．Discovery’s protective heat tiles ate out of order.
C．NASA has made the decision on whether anything needs to be done about the gap fillers.
D．According to NASA there is only a problem with Discovery and it can return to the earth safely.