Which of the following operations should only be allowed to be done when the CPU is in kernel mode? Group of answer choices 1) Read data from a file 2) Open a file for reading, writing, or both 3) Set the time-of-day clock  4) Read the time-of-day clock   A programmer opened a file using the file descriptor fd.  The file contains the following sequence of bytes:     12, 14, 33, 33, 33, 12, 14, 1, 6, 33, 12, 14, 1, 6, 12 The programmer then uses these two system calls:    lseek(fd, 3, SEEK_SET);    read(fd, &buffer, 4); note, the lseek call makes a seek to byte 3 of the file.  What does buffer contain after the read system call completes? Group of answer choices 1) 33 33 33 12 2) 33 33 12 14 3) 33 12 14 1 4) 33 12 14   In a uniprocessor system, multiprogramming increases processor efficiency by: Group of answer choices 1) All of the above 2) Increasing processor speed 3) Eliminating all idle processor cycles 4) Taking advantage of time wasted by long wait interrupt handling

Chapter 4. Homework Assignment (read instructions carefully) Write a program that asks the user for the name of a file. The program should read all the numbers from the given file and display the total and average of all numbers in the following format (three decimal digits): Total: nnnnn.nnn Average: nnnnn.nnn Class name: FileTotalAndAverage   Here is a working code but please modify it so it passes the test cases because I run it it does not work: Also I do not need Goodbye. I run it through Hypergrade which has all the test cases and it does not pass. It says 0 out of 7 passed import java.io.File; //importing java.io.Fileimport java.io.FileNotFoundException; //importing FileNotFoundException for exception handlingimport java.util.Scanner; //importing Scanner for user inputpublic class FileTotalAndAverage { //class FileTotalAndAverage   public static void main(String[] args) throws FileNotFoundException {       Scanner keyboard = new Scanner(System.in); //declaring and…

Write Visual basic codes to illustrate how to perform the following in Sequential Access files; a) open a sequantial file b) read a sequantial file c) write a sequancial file