Long description

Figure (a): There are three rows and three columns. The rows are labeled Erica, Henny, and Roberta. The columns are called Objects. The columns are labeled Compiler, Mailbox 7, and Secret. The row entries are given as follows. Row 1: Column 1: Read, Execute. Column 2: Empty. Column 3: Empty. Row 2: Column 1: Read, Execute. Column 2: Read, Write. Column 3: Empty. Row 3: Column 1: Read, Execute. Column 2: Empty. Column 3: Read, Write. Figure (b): There are three rows and three columns. The rows are labeled Erica, Henny, and Roberta. The columns are called Objects. The columns are labeled Compiler, Mailbox 7, and Secret. The row entries are given as follows. Row 1: Column 1: Read, Execute. Column 2: Empty. Column 3: Empty. Row 2: Column 1: Read, Execute. Column 2: Read, Write. Column 3: Empty. Row 3: Column 1: Read, Execute. Column 2: Read. Column 3: Read, Write.