A catastrophic virus causes widespread and often irrecoverable damage to data on a system and its connected devices. Such viruses are designed to rapidly corrupt, delete, or overwrite data, leading to system failure and loss of operational capability.
Innocuous Bug (A) implies minimal or no harm.
Hostile worm (C) can be destructive but is not a defined term for this scenario.
Trojan Horse (D) is deceptive but does not usually cause sudden widespread destruction immediately.
[References:, , ASIS POA Manual – Virus Classifications and Impact, , PSP Study Guide – Malware Threat Profile, ]
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