Sound Financials Corporation sends daily e-mail ads to its previous customers and those who have opted to receive the notices. Instable Investments, Inc., sends e-mail ads to any e-mail address that Instable can find on the Web or otherwise generate. Refer to Fact Pattern 9-1. In those states with antispam laws, federal law:.a. prohibits or regulates the use of spam. b. requires the use of spam by business entities. c. bans the use of spam altogether. d. preempts the application of state law to commercial e-mail with certain exceptions.