Bubble-to-bubble connection intuition (De Morgan view): If a signal leaves a gate through an inverted (bubbled) output and enters the next gate on an inverting (bubbled) input, the two inversions cancel, producing an overall non-inverting transfer rather than a single remaining inversion. Evaluate this statement.

Introduction / Context:
Logic symbols often show inversion as a small bubble. Understanding how “bubble-to-bubble” connections behave is crucial for reading schematics quickly and for using De Morgan transformations to simplify or restyle logic without changing function.

Given Data / Assumptions:

• One gate provides an inverted output (bubble on its output).
• The next gate has an inverting input (bubble on its input pin).
• We are reasoning functionally, assuming ideal logic levels.

Concept / Approach:
A bubble denotes inversion. Two inversions in series cancel each other, yielding a non-inverting connection. This is a visual manifestation of De Morgan equivalences and the idea that NOT(NOT(X)) = X. Therefore, bubble-to-bubble effectively passes the signal without net inversion.

Step-by-Step Solution:

Verification / Alternative check:
Substitute concrete logic levels: if S = 1, the producing gate output is 0; the inverting input interprets that as NOT(0) = 1 at its internal logic. If S = 0, the chain delivers 0. This confirms cancellation.

Why Other Options Are Wrong:
“Correct” repeats the original claim that one inversion remains; that is the opposite of the cancellation result. “Only true for CMOS” and “Depends on fan-out” are red herrings; the cancellation is logical, not process-dependent.

Common Pitfalls:
Mistaking symbol bubbles as delay markers; forgetting that each bubble is a NOT; assuming bubbles affect only thresholds instead of logic sense.

Final Answer:
Incorrect