Answer: Send billing statement.
Step-by-step explanation:
A marketer is a person whose function is to market a product or a service through marketing strategies to reach the highest number of people or customers.
Mobile channels are excellent tools for marketers because it allows them to reach a variety of people faster than otherwise, it would be impossible to achieve. It also contributes to obtaining statistical data about the product they are selling and the people who are buying it, for example, which population likes the article the most.
The marketer is not responsible for the collection of the product, therefore is least likely to send billing statement.
I hope this information can help you.