Assume that there are four domains and four objects, F1, F2, F3 and a Printer. A process executing in domain D1 can switch to D2 and has read access to F1 and F3. A process executing in domain D4 can switch to D1 and has the same privileges as one executing in domain D1; but in addition, it also has write access. A process in domain D3 has read access to F2 and has execute access to F3. The printer can be accessed only by a process executing in domain D2 which has the permission to switch to D3 and D4. Illustrate the scheme using an Access Matrix with domains as objects.