8 1 point When a file descriptor is opened, the value of the file descriptor is An integer who's value is the lowest numbered available file descriptor. A pointer to a complex object within the kernel. A pointer to a buffer within the kernel. An integer, but its value depends upon device type. 9 1 point How does one UNIX program invoke a child program? It calls spawn process. It calls open. It calls fork 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... D