Answer:
Option B i.e., hoax emails is the correct option to the following question.
Step-by-step explanation:
The following option is correct because the hoax emails are the mails that are threatening and demanding for something which are valuable for the person. Who is sending these cheap email then theses persons are the criminals and these activities come under the DoS or DDoS attack which are illegal.
So, that's why the following option is correct.