Multiple choice

Protection rings are introduced in _____.

  1. MULTICS

  2. DOS

  3. UNIX

  4. LINUX

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protection rings were first introduced in the MULTICS operating system, developed in the 1960s. MULTICS pioneered many security concepts including ring-based protection. This hierarchical privilege model was later adopted in other systems including the x86 architecture's ring levels (0-3).