AuthorsIdeasA. Bill BishopHe has been a consultant in developing plans and implementing digital and online marketing programs. He shows how to build a digital marketing strategy, develop a plan, and execute it in "Strategic Marketing for the Digital Age". B. D. BirdDrayton Bird's book, "Commonsense Direct Marketing" is packed with international case studies that show how companies worldwide have implemented his ideas.The author brings clarity to direct marketing methods by focusing on his own techniques.C. Daniel S. JanalHe is the founder and President of Janal Communications, an online marketing and PR agency. One of the most respected Internet marketing experts, he has helped thousands of small businesses and entrepreneurs set up shop on the Internet with the help of his book "Online Marketing". D. Jeffery F. Rayport"Managing in the Marketspace" article was first introduced by Jeffery F. Rayport and John Sviokla in 1994 that appeared in Harvard Business Review.In this article, the authors distinguished between electronic and conventional markets.Therefore, it is clear from the above explanation that option 1) is the correct answer.