question 8, 9 and 10.

8 1 point When a file descriptor is opened the value of the file descriptor is A pointer to a complex object within the kernel. A pointer to a buffer within the kernel. An integer who's value is the lowest numbered available file descriptor. An integer, but its value depends upon device type. 9 1 point How does one UNIX program invoke a child program? O It calls spawn process. It calls open It calls fork o it calls execve. 10 3 points Fill in the blank parts of this UNIX system call in order to print the screen on standard output. type your answer. (type your answer... "hello world " type your answer... )