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When developing an application program, in order to request a service from the operating system O a. The developer uses system calls O b. The

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When developing an application program, in order to request a service from the operating system O a. The developer uses system calls O b. The developer uses application programming interfaces (APIs) c. System calls and application programming interfaces (APIS) are not needed d. A and B e. The developer has to access the OS kernel directly

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