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.