To answer this question, you need to understand the different types of malicious software and their functionalities. Let's go through each option to understand why it is correct or incorrect:
Option A) Trojan - This option is correct. A Trojan is a type of malicious software that disguises itself as a legitimate program to trick users into installing it. Once installed, a Trojan can create a "backdoor" internet connection, allowing unauthorized access to a user's computer.
Option B) Virus - This option is incorrect. A virus is a type of malicious software that can replicate and spread itself by attaching to other programs or files. While a virus can cause various types of damage to a computer, it does not typically install a "backdoor" internet connection.
Option C) Worm - This option is incorrect. A worm is a type of malicious software that can replicate itself and spread across networks without requiring user interaction. While a worm can cause significant harm by consuming network bandwidth and disrupting systems, it does not typically install a "backdoor" internet connection.
Option D) Adware - This option is incorrect. Adware is a type of software that displays unwanted advertisements on a user's computer. While adware can be annoying and intrusive, it does not typically install a "backdoor" internet connection.
The correct answer is Option A) Trojan. This option is correct because a Trojan is most likely to install a "backdoor" internet connection, allowing unauthorized access to a user's computer.