A trapdoor (also known as a backdoor) is a hidden method used by developers or attackers to bypass normal authentication or access controls in software. However, in technical distinction, a “trapdoor” refers more to unintentional or overlooked access, while “backdoor” is often intentional. For this question, since it emphasizes “unintentional access,” trapdoor is the best fit.
Bomb (A): Refers to logic bombs—malicious code triggered by specific conditions.
Backdoor (C): Usually intentionally left in place by developers or attackers.
Trojan Horse (D): Malware disguised as legitimate software.
[References:, , ASIS POA Manual – Software Vulnerabilities, , PSP Study Guide – Trapdoors and Security Flaws, ]
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