Answer:
(D) denial of service
Step-by-step explanation:
Denial of service -
It is a type of cyber - attack where offender tries to make the source of network or the machine unavailable for the user via disturbing the service of the of the internet .
The task of denial of service is done by flooding the machine or the source with many requests in a way to overload the system .
Hence , from the question , the example shown in the question is about denial of service .