Farès has noted malware on the workstations of several users. This particular malware gives administrative privileges for the workstation to an external hacker. Which of the following BEST describes this malware?

Rootkit - This type of malware is designed to give an attacker administrative access to a computer or network without being detected. Once installed, a rootkit can hide its presence and allow an attacker to perform a variety of malicious activities, such as stealing data, modifying files, or installing additional malware.
Trojan horse - This type of malware is designed to appear as a legitimate program or file, but actually contains malicious code that can perform a variety of malicious activities, such as stealing data, modifying files, or providing unauthorized access to a computer or network.
Logic bomb - This type of malware is designed to execute a malicious action when a specific condition is met, such as a particular date or time, or when a specific event occurs.
Multipartite virus - This type of malware is designed to infect multiple parts of a computer system, such as the boot sector and executable files, and can be difficult to detect and remove.