Final answer:
Harassing other internet users and sharing friends' personal messages can be punishable under the law.
Step-by-step explanation:
Out of the given options, A. Harassing other internet users and B. Sharing friends' personal messages can be punishable under the law.
Harassment of other internet users, such as cyberbullying or online stalking, can lead to legal consequences as it violates laws against harassment and invasion of privacy.
Sharing personal messages without permission can also be illegal, as it can violate privacy laws and the right to control personal information.
Learn more about Online behavior punishable under the law