The subject line should be keyed one blank line below the salutation.

Which of the following statements about ADTs are true.

A) They specify the values the data type can hold. B) They specify the operations the data type can perform. C) They hide the details of how the data type is implemented. D) They do all of the above. E) They do A and B, but not C.

Users will most often write down their passwords if they are forced to change them too often and when X history is set to a high number of passwords. ___ history is used to prevent users from repeatedly using the same password.

Fill in the blank(s) with the appropriate word(s).