What protection rings are engaged if the computer is executing in supervisory mode?
A.
Rings 0 and 1
B.
Rings 1 and 2
C.
Rings 2 and 3
D.
Rings 3 and 4
Explanation:
Supervisory mode is also known as privileged mode, where execution
takes place by the operating system (Ring 1) and its kernel (Ring 0). Ring 3 covers
the operating system utilities and drivers, and Ring 4 is User mode, where
applications and programs are executed.
In reality, each operating system will be written to use the different rings as
dictated by the developers of the operating system. Some systems only use two or
three Rings. But the question asks for supervisory mode, which are always the lowest
number Ring numbers.