How is the ButtonGroup class used? Select one or more: a. A ButtonGroup object is used with a set of radio buttons (or radio button menu items), to make sure that at most one of the radio buttons in the group can be selected at any given time. b. To use the ButtonGroup class, you have to create a ButtonGroup object, grp. Then each radio button, rb, that is supposed to be part of the group is added to the group by calling grp. add(rb). Nothing further needs to be done with the ButtonGroup object. c. Creating a set of buttons with the same ButtonGroup object means that turning "on" one of those buttons turns on all other buttons in the group. d. Typically a button group contains instances of JRadioButton, JRadioButtonMenuItem, or JToggleButton.

Which best describes the condition under which the unicode output is the same as plain text?

What are the three uses of a screw?

1. ask the user how many questions are in the quiz. 2. ask the user to enter the key (that is, the correct answers). there should be one answer for each question in the quiz, and each answer should be an integer. e.g., 34 7 13 100 81 3 9 10 321 12 might be the key for a 10-question quiz. you will need to store the key in an array. 3. ask the user to enter the answers for the quiz to be graded. there needs to be one answer for each question. note that these answers do not need to be stored; each answer can simply be compared to the key as it is entered. 4. when the user has entered all of the answers to be graded, print the number correct and the percent correct. 5. add a loop so that the user can grade any number of quizzes with a single key. after the results have been printed for each quiz, ask "grade another quiz? (y/n)." note: you only have one array (the key). you are not creating a new key for each set of quiz answers.