9.
directory
a. telephone
b. listing
c. computer
d. names
Answer: b
A
directory is a listing of names or things, so choice b is the essential
element. A telephone (choice a) often has a directory associated with it, but
it is not essential. A computer (choice c) uses a directory format to list
files, but it is not required. Names (choice d) are often listed in a
directory, but many other things are listed in directories, so this is not the
essential element.
