An Attacker Cracks a User's Password for All Social Media

Multiple Choice

An attacker cracks a user's password for all social media, email, and bank accounts. The user needs to change the passwords for all these accounts. Which of the following should the user do in the future to prevent this from happening?

A) Disable unused browser toolbars.
B) Clear the browser cache.
C) Avoid credential reuse.
D) Delete tracking cookies.