Final answer:
d) all of the mentioned.System calls are used to open, read, and write files in a computer system, hence the answer is all of the mentioned options.
Step-by-step explanation:
The question is about system calls in the context of working with files on a computer system. System calls provide the interface between a process and the operating system, and there are various system calls for different operations. Specifically, system calls can be used to a) open the file, b) read the file, and c) write into the file. Therefore, the answer to the question would be d) all of the mentioned.
When writing a program that works with files, you will typically use these system calls in various sequences to manipulate files. For example, before you can read or write to a file, you first need to open it with the appropriate system call. Once you are finished with the file, you typically use another system call to close it.
The correct answer is d) all of the mentioned. By using a specific system call, we can open a file, read the file, and write into the file. System calls are used in programming languages to request services from the operating system. For example, in the C programming language, the system call open() is used to open a file, read() is used to read from a file, and write() is used to write into a file.