Which part would not be found in a thermal printer?

The main objective of creating a(n) ____ field in a table is to prevent users from entering duplicate records into the table.

A. primary key B. lookup C. input mask D. validation

Modify the Time class of Fig. 7.13 to include a tick method that increments the time stored in a Time object by one second. The Time object should always remain in a consistent state. Write a driver program that tests the tick method. Be sure to test the following cases:

a) Incrementing into the next minute. b) Incrementing into the next hour. c) Incrementing into the next day (i.e., 23:59:59 to 0:00:00).