Typical application of an S–R flip-flop: Select the most appropriate use-case that directly leverages the S–R flip-flop’s set/reset storage capability.

Introduction / Context:
The S–R flip-flop is a fundamental one-bit memory element. It stores a binary state until explicitly changed by set or reset inputs. Understanding its canonical use helps distinguish it from oscillators and pulse generators that require feedback networks and timing components rather than simple set/reset control.

Given Data / Assumptions:

• S–R flip-flop offers two stable states: Q=1 (set) and Q=0 (reset).
• No requirement for continuous toggling or timing components.
• We seek a direct, primary application.

Concept / Approach:
A binary storage register is built by combining multiple one-bit storage elements (flip-flops). Each S–R element can hold one bit reliably, making it a natural building block for registers, flags, and simple control latches. While S–R elements can be part of more complex timing circuits, their core role is storage, not oscillation or pulse shaping.

Step-by-Step Solution:

Verification / Alternative check:
Textbook block diagrams for registers depict banks of flip-flops; asynchronous set/reset controls are commonly used for initialization, validating the use-case.

Why Other Options Are Wrong:

• Astable oscillator: Requires continuous feedback and timing components; not a simple S–R latch function.
• Transition pulse generator: Typically uses differentiating networks/monostables.
• Racer: Not a standard application; “race” usually refers to an undesirable timing condition.
• Frequency-to-voltage converter: Analog function unrelated to simple set/reset storage.

Common Pitfalls:
Assuming any two-state device is an oscillator; oscillation needs periodic feedback conditions, while a flip-flop stores state until commanded to change.

Final Answer:
binary storage register