Answer the questions by circling the correct answer. Which list box method is passed a numeric index and removes the item at that index? a. Remove b. RemoveAt c. Remove Index d. There is no such method as the string to be removed is the argument. What is the index of the last item stored in a nonempty list box named 1stOut? a. 0 b. 1stOut.Items(1) c. 1stOut.Items.Count d. 1stOut Items Count - 1 The next question refer to the list box named 1stOut shown below. In the which line of code would correctly change name "Bob" to "Brian"? a. 1stOut.Selectedltem = "Brian" b. 1stOut.Items (1)= "Brian" c. 1stOut.Items(2) = "Brian" d. 1stOut.Items.Add ("Brian") What is the best definition of the term sentinel used in programming? a. A sentinel is a either a line break, Tab marker, or end-of-file character in a file. b. A sentinel is a warning or error message that appears if code attempts an unauthorized activity. c. A sentinel is a Boolean variable that flags the occurrence of some event. d. A sentinel is a special value used to trigger loop exit