What Is the Focus of the Children's Internet Protection Act

What is the focus of the Children's Internet Protection Act (CIPA) ,which the Supreme Court has found constitutional?

A) This law focused on schools and libraries that receive federal money.
B) The CIPA would stop money from going to schools and libraries that do not install "technology protection measures" on their computers accessing the Internet.
C) Those schools and libraries wanting to continue receiving federal funds would have to install filtering software that blocks obscenity,child pornography,or material "harmful to minors."
D) All of the above.