What type of software would be involved in enhancing the performance of an application?

The correct answer is a patch, which is a type of software enhancement that is specifically designed to improve the performance or functionality of an existing application. Patches can address various issues, including bugs, security vulnerabilities, and performance enhancements, thus helping to optimize the application's behavior and efficiency.

When a patch is applied to software, it may also include updates that enhance the application's capability or add new features without requiring a complete overhaul or reinstallation of the software. This ability to improve performance through relatively minor updates makes patches a critical component in the ongoing maintenance and management of software applications.

Other options like licensable and non-licensable may refer to the nature of the software in terms of its licensing agreement, but they do not directly address software specifically engineered to enhance performance. "Unknown" does not provide any relevant context or specifics in relation to improving application performance.