Milo Is Trying to Learn All He Can About a Network

Multiple Choice

Milo is trying to learn all he can about a network. He is looking for easy things he can do that might reveal information. Eventually, he can collect all of that data and after analysis learn perhaps enough to have a complete picture. One technique is to send email to email addresses with different status such as; valid users, non-existent addresses, users on vacation, employees that are no longer there, and commonly named email groups.
What would be a reason for doing this?

A) To verify information about the email administrator
B) Gather information about internal hosts
C) See how the IT department responds to a Denial of service attack
D) To learn about the internal policies for handling such events