The Computer Fraud and Abuse Act (CFAA) is primarily designed to address unauthorized access to computers and related systems. Among the options provided, the behavior that it would most clearly protect against would be:
- A teenager illegally downloading a song: This act may involve unauthorized access to a computer network or service, which the CFAA aims to prevent.
The other options do not typically fall under the protection of the CFAA. Accessing a bank account from another state is generally legal if you have authorized access. Advertising online to children under 13 is regulated by different laws (such as COPPA). Posting negative comments on Facebook is generally protected by the First Amendment and does not violate the CFAA.
So, the correct answer regarding what behavior the CFAA would protect against among these options would most likely be related to the unauthorized downloading of songs.