A core component of NetWare consists of the services available for managing and using ____________________.

________ is used to indicate that a value is unknown, and it is treated differently than other values because it has no value

Fill in the blank(s) with correct word

Answer the following questions true (T) or false (F)

1. A class invariant is a statement that is always true for every object of the class. 2. You should avoid the use of null as an argument to a method.