which of the following parts?

The access matrix model consists of which of the following parts? (Choose all that apply)

A.
A function that returns an objects type.

B.
A list of subjects.

C.
A list of objects.

Explanation:
The access matrix model consists of four major parts:
A list of objects
A list of subjects
A function T that returns an object’s type
The matrix itself, with the objects making the columns and the subjects making the rows
Note: This question seems to confuse access control matrix, Harris, 3rd Ed, p 169 with access
control types, Ibid, p 188ff
“An access control matrix is a table of subjects and objects indicating what actions … subjects can
take upon … objects”, Harris, 3rd Ed, p 169.
It would be right if item “A” was “a function that returned an access right”