What kind of Denial of Service attack was best illustrated in the scenario above?

Bob was frustrated with his competitor, Brownies Inc., and decided to launch an attack that would
result in serious financial losses. He planned the attack carefully and carried out the attack at the
appropriate moment.
Meanwhile, Trent, an administrator at Brownies Inc., realized that their main financial transaction
server had been attacked. As a result of the attack, the server crashed and Trent needed to reboot
the system, as no one was able to access the resources of the company. This process involves
human interaction to fix it.
What kind of Denial of Service attack was best illustrated in the scenario above?

A.
Simple DDoS attack

B.
DoS attacks which involves flooding a network or system

C.
DoS attacks which involves crashing a network or system

D.
DoS attacks which is done accidentally or deliberately