Terminology check: In digital design, complete systems that operate on two discrete levels are often called ________.

Introduction / Context:
Digital systems process information using discrete voltage levels (commonly interpreted as 0 and 1). This question checks familiarity with common terminology for such systems.

Given Data / Assumptions:

• Two-level operation is implied.
• We want the standard, widely used term.

Concept / Approach:
Because the information is represented using two symbols, these systems are routinely called “binary systems.” They are also discussed within “logic systems,” but “numbering systems” and “ADC systems” refer to different ideas.

Step-by-Step Solution:

Verification / Alternative check:
Textbooks frequently denote digital circuits as binary logic circuits and digital systems as binary systems because they encode data in base-2.

Why Other Options Are Wrong:

Common Pitfalls:
Equating “logic systems” (a valid phrase) with the more precise “binary systems” when the emphasis is specifically on two discrete levels.

Final Answer:
binary systems