Final answer:
Cybersecurity is the correct answer for protecting a computer against unauthorized access or attack. It encompasses various measures including malware detection, identity protection, and fraud detection. Individuals, companies, and governments all must employ robust security practices to guard against cyber threats.
Step-by-step explanation:
The correct answer to the question of which option is used to protect a computer against unauthorized access or attack is b) cybersecurity. Cybersecurity refers to the practices, technologies, and processes designed to protect computers, networks, programs, and data from attack, damage, or unauthorized access. This is a broad field that includes various measures such as malware detection, which is a part of cybersecurity aimed at identifying and removing malicious software; identity protection, which safeguards personal data and prevents identity theft; and fraud detection, which is used primarily to identify and prevent fraudulent actions.
For individuals, enhanced security measures may include implementing two-factor authentication, creating stronger passwords, and participating in education on how to avoid scams and recognize phishing attempts. Companies and governments need to enforce stronger protections for websites and internal systems to ensure the safety of sensitive information.