Which of the following uses a directed graph to specify the rights that a subject can transfer to an
object, or that a subject can take from another subject?

A.
Take-Grant model

B.
Access Matrix model

C.
Biba model

D.
Bell-Lapadula model

Explanation:
The Take-Grant System is a model that helps in determining the protection rights
(e.g., read or write) in a computer system. The Take-Grant system was introduced by Jones,
Lipton, and Snyder to show that it is possible to decide on the safety of a computer system even
when the number of subjects and objects are very large, or unbound. This can be accomplished in
linear time based on the initial size of the system. The take-grant system models a protection
system which consists of a set of states and state transitions. A directed graph shows the
connections between the nodes of this system. These nodes are representative of the subjects or
objects of the model. The directed edges between the nodes represent the rights that one node
has over the linked node.