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Correct answer: C. A cap on how much you can interact with Claude over a time period
Explanation
The principle — usage is an allowance over time, not a counter of anything you can see on screen.
Why the key is correct — Anthropic states plainly that usage limits control how much you can interact with Claude over a specific time period. That framing is deliberately not a message count.
Why the others are wrong — stored conversations and stored files are governed by separate rules and cost you no allowance. And a flat per-day message number cannot describe something that varies with the work.
Remember this — it is a budget for interaction over a window, and what you ask for changes how fast it runs down.
Sources — Anthropic's usage and length limits article.
Sources
“Usage limits control how much you can interact with Claude over a specific time period.”
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