31. Which of the following statements regarding the Scanner and Formatter classes is/are not true. (Select all that apply)

a. Scanner and Formatter classes are contained in the java.lang package of classes.

b. Character-based input and output can be performed with the Scanner class.

c. The Formatter class enables formatted data to be output to any text-based stream similar to System.out.printf.

d. The Scanner class is used extensively to input data from the keyboard.