According to the IAPP CIPP/US Study Guide, more than half of U.S. states require telemarketers to register with the state before conducting business within the state. This registration requirement may involve paying a fee, posting a bond, or providing information about the telemarketer's identity, location, and business practices. The purpose of this requirement is to protect consumers from fraudulent or deceptive telemarketing calls and to facilitate the enforcement of state laws and regulations. The other options are not required by most states, although some states may have additional rules or guidelines for telemarketers regarding identification, consent, or contracts. References:
* IAPP CIPP/US Study Guide, Chapter 7: Marketing and Advertising
* State Telemarketing Registration Requirements