Answer:
e. permission-based e-mail marketing
Step-by-step explanation:
Permission-based email marketing is one of the types of marketing done through digital media. In this system, the emails related to the product are sent to individuals who are willing and have given their consent to receive them. The customers give their consent by agreeing to the action being taken to receive the mails. When the individual signs in, he is permitting to exchange the communications. In the given situation, Kelly has filled the form and has agreed on the terms of receiving the emails. It was because of this reason that she would receive emails from the company.