The correct answer is: D. Waste reduction
E-mail is a method of exchanging digital messages from an author to one or more recipients. A message can be written using plain text or rich text formats, and is usually sent through a network such as the Internet.
E-mail is a low-cost form of communication, as it does not require the use of paper or postage. It is also a high-speed form of communication, as messages can be sent and received almost instantaneously. E-mail can also be used to maintain records in a database, as messages can be archived and searched.
However, e-mail is not a form of waste reduction. In fact, e-mail can actually contribute to waste, as messages can be sent and received without being read or deleted. Additionally, e-mail can be used to send spam, which is unsolicited and unwanted e-mail. Spam can be a nuisance and can also contain viruses or malware.
Therefore, the correct answer is D. Waste reduction.