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

(a) application

(b) client

(c) virtualization

(d) none of the mentioned

This question was addressed to me by my school teacher while I was bunking the class.

My question is taken from Porting Applications topic in chapter Abstraction and Virtualization Layer and Capacity Planning of Cloud Computing

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The correct option is (c) virtualization

The best explanation: The running application in AppZero changes none of the registry entries or any of the files on the Windows Server.

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