Final answer:
Option D: A disgruntled computer programmer is least likely to use a backdoor to sabotage information security.
Step-by-step explanation:
A disgruntled computer programmer who has been fired by an organization may resort to various methods to sabotage information security. The options given in the question are A. logic bomb, B. trojan horse, C. virus, and D. backdoor.
Out of these options, backdoor is the method that is least likely to be used by a disgruntled programmer to sabotage information security. A backdoor is a method used by attackers or hackers to gain unauthorized access to a system by exploiting a vulnerability or weakness. It is not typically used by someone who has worked as a programmer within the organization and has been fired.
In contrast, logic bombs, trojan horses, and viruses are commonly used by disgruntled programmers to cause harm to the organization or its systems. A logic bomb is a piece of code that is intentionally inserted into a program and designed to execute a malicious action at a specific time or when certain conditions are met. A trojan horse is a type of malware that disguises itself as a harmless program but performs malicious actions once executed. A virus is a type of malware that self-replicates and spreads from one computer to another, causing damage to data or disrupting the normal operation of a system.