Describe each of the following four kinds of access control mechanisms in

terms of (a) ease of determining authorized access during execution, (b) ease of

adding access for a new subject, (c) ease of deleting access by a subject, and (d)

ease of creating a new object to which all subjects by default have access.

per-subject access control list (that is, one list for each subject tells

all the objects to which that subject has access)

per-object access control list (that is, one list for each object tells all

the subjects who have access to that object)

access control matrix

capability