Which of the following layer serves as the mediator for file I/O, the memory I/O, and application calls and response to DLLs?

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Porting an application is the process of adapting a software application to run on a different operating system and hardware architecture. This involves recompiling the application and making any necessary changes. 
In software engineering, porting is the process of adapting software to run in a different computing environment. This could be a different CPU, operating system, or third party library. 


Which of the following layer serves as the mediator for file I/O, the memory I/O, and application calls and response to DLLs?