Consider a computer system with three users: alice, bob, and cathy. alice owns the file file, and bob and cathy can read it. cathy can read and write bob's file bfile, but alice can only read it. only cathy can read and write her file cfile. assume that the owner of each of these files can execute his/her file. 1.a.) list acl of objects. 1.b.) list capabilities of subjects. 1.c.) create the corresponding access control matrix for this scenario. 1.d.) by using the appropriate primitive commands in section 2.3 of the textbook, write the primitive commands for the following access right changes: - cathy gives alice permission to read cfile. - alice removes the right for bob to read the file. 1.e.) show the new access control matrix after 1d is executed.