Paul is a financial analyst for King Investments, Inc., a brokerage firm. He uses the Internet to investigate the background and activities of companies that might be good investments for King’s customers. While visiting the Web site of Business Research, Inc., Paul sees on his screen a message that reads, “Welcome to businessresearch.com. By visiting our site, you have been entered as a subscriber to our e-publication, Companies Unlimited. This publication will be sent to you daily at a cost of $7.50 per week. An invoice will be included with Companies Unlimited every four weeks. You may cancel your subscription at any time.” Has Paul entered into an enforceable contract to pay for Companies Unlimited? Why or why not?