When shelly downloaded an arcade game from an unknown internet web site, an unauthorized connection unknown to shelly was established with her computer. the arcade game is most likely to be a. adware b. a trojan horse c. spyware d. encryption e. a worm.

B. a Trojan horse

Explanation:

A Trojan Horse is a malware that disguises itself as a legitimate code or software. In this scenario, Shelly downloaded what she thought was an arcade game. When the file is executed, it gives the attacker remote access to the affected computer allowing them to steal and access sensitive information on the user's computer This type of Trojan Horse malware is specifically known as a Remote Access Trojan (RAT).

i'm so sorry that's not a question and this isn't an answer