File _________________________ are identified by a three- or four-letter suffix after the file name.

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

1. A base class is a class that inherits the members of another class. 2. A subclass cannot add new members to those it inherits from the superclass. 3. A superclass’s private data fields can be revised by one of its subclasses.

Files on disk are identified by a(n) ____________.

a. index b. filename c. access number d. binary signature