What is the main purpose of the Do-Not-Call Registry maintained by the Federal Trade Commission?

The main purpose of the Do-Not-Call Registry maintained by the Federal Trade Commission is to allow individuals to opt out of sales calls. This registry provides consumers with a mechanism to signal their preference to not receive unsolicited telemarketing calls. By registering their phone numbers, individuals can take control over their privacy and reduce the volume of unwanted sales calls they receive. This initiative reflects an effort to protect consumers from intrusive marketing practices and enhance their ability to manage communications effectively.

In the context of the other options, the Do-Not-Call Registry is specifically focused on telemarketing and does not relate to the tracking of unsolicited emails, financial transactions, or the regulation of financial institutions. Each of those aspects falls under different regulatory frameworks and focuses that do not pertain to consumer telemarketing preferences.