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Q4. Environment variables and system() In this task, we study how environment variables are affected when a new program is executed via the system() function. This function is used to execute a command, but unlike execve(), which directly execute a command, system() actually executes"/bin/sh -c command", i.e., it executes /bin/sh, and asks the shell to execute the command. If you look at the implementation of the system() function, you will see that it uses exec() to execute /bin/sh; excel() calls execve(), passing to it the environment variables array. Therefore, using system(), the environment variables of the calling process is passed to the new program /bin/sh. Please compile and run the following program to verify this. #include #include int main() { system("/usr/bin/env"); return 0; }