Which of the following statements is true regarding creating a successful spam email campaign?

Question $5$Answer

a$.$

Most spam campaigns use an actual sender email address, rather than a temporary one.

b$.$

The sender$\text{'}$s identity has to be a person or entity that is unknown or unfamiliar to the recipient.

c$.$

The decision to use a real or false sender address depends on whether or not the spammer wishes the recipient to ultimately delete the email.

d$.$

When the sender is a known contact of the target, using the sender$\text{'}$s actual email address increases the appearance that the email is proper.