In a medium$-$sized organization, the IT department manages a wide range of applications employees use. Recently, the IT security team identified a growing number of security incidents related to malware infections and unauthorized access to sensitive data. They suspect that certain applications may be the entry point for these attacks. To mitigate the risks, the team wants to implement a security measure that isolates applications from the rest of the system to prevent potential threats from spreading. They aim to achieve this without affecting the overall performance and usability of the applications. Which security measure should the IT security team consider implementing to isolate applications from the rest of the system, reduce the impact of potential security threats, and maintain optimal performance and usability?

A$.$ Sandboxing

B$.$ Firewall

C$.$ Antivirus software

D$.$ Intrusion detection system $($IDS$)$