Which of the following attacks specifically impacts data availability?

A DDoS attack floods a target system, network, or service with massive amounts of traffic from multiple sources, exhausting resources such as bandwidth, CPU, or memory. This prevents legitimate users from accessing the service, making it a direct attack on availability - one of the three core principles of the CIA (Confidentiality, Integrity, Availability) triad. Unlike other attack types, DDoS does not aim to steal or alter data, but solely to disrupt access.

A Trojan is a form of malware that disguises itself as legitimate software to gain unauthorized access or steal data, primarily targeting confidentiality and integrity rather than availability.

A Man-in-the-Middle (MITM) attack intercepts communications between two parties to eavesdrop or alter data in transit, which primarily threatens confidentiality and integrity, not availability.

A Rootkit is a stealthy type of malware that provides privileged access to a system while hiding its presence, primarily targeting confidentiality and integrity by concealing malicious activity rather than disrupting availability.