Question 1: Consider the following access control matrix 1) Explain its content. 2) Assume a secure system is implementing the above matrix using the access control list (ACL) model. Show the ACL associated with the object f5? Explain the procedure to be used by the secure system to deal with a read access request from subject s4 to object f5. 3) Assume a secure system is implementing the above matrix using the capabilities list (Clist) model. Show the C-list associated with subject s2? 4) Explain which implementation of the access control matrix (i.e., ACL vs. C-list) is much better for each of following operations? a. Revoke an access right (ex., read) to all objects from one subject (ACL, Capability). b. Revoke an access right (ex., read) to an object from all subjects (ACL, Capability)