Consider the ICS $431$ Lab's file protection policy. Assume Ahmed can read and write to file filex.sys$,$ can read the file filey.sys$,$ then switch to another domain where he can execute the file filez.sys$.$

Bassam can read and write to filey.sys$,$ and cannot access filez.sys or filex.sys Ali can read filex.sys$,$ execute filey.sys$,$ and then switch to write into filez.sys

A$.$ Write the Access Matrix that demonstrates the above policies?

B$.$ Identify one of the discussed methods for implementing Access Matrix, justily why do you select that method and then use that method to implement the Access Matrix set in part A of this question.