Solution

The correct answer is (b) Cyber Attack.

A Cyber Attack is an attempt to harm, damage, or cause a threat to a system or network using technology, such as a computer or the internet. Cyber attacks can take many forms, including malware, phishing, ransomware, denial-of-service (DoS) attacks, and many others. The goal of a cyber attack is often to steal data, disrupt services, or gain unauthorized access to systems or networks.

Option (a) Cyber-crime refers to any criminal activity that involves the use of a computer or network, including cyber attacks but also other forms of crime such as identity theft, fraud, and online harassment.

Option (c) System hijacking refers to the act of taking control of a computer system without the owner's consent or knowledge, often for malicious purposes.

Option (d) Digital crime is a broad term that encompasses all criminal activities that involve digital technology, including cyber attacks, cyber crime, and other forms of illegal activities carried out using computers or the internet.