The Computer Fraud and Abuse Act (CFAA) primarily addresses issues related to unauthorized access to computers and networks. Out of the options provided, the behavior that the CFAA would most directly protect someone from is:
A teenager illegally downloading a song.
Unauthorized access to a computer system (such as downloading copyrighted material without permission) can fall under the provisions of the CFAA. However, it’s important to note that issues related to copyright infringement might be more commonly addressed under copyright law.
The other options, such as accessing a bank account or posting comments on Facebook, are generally not criminalized under the CFAA unless they involve unauthorized access or breach of terms of service.