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Correct answer: D. It all counts toward the same usage limit
Explanation
The principle — the plan is the unit, not the app you happen to be sitting in.
Why the key is correct — Anthropic notes explicitly that usage of all the different Claude product surfaces, naming claude.ai, Claude Code and Claude Desktop, counts toward the same usage limit.
Why the others are wrong — none of the surfaces carries a private allowance, none is unmetered, and nothing is averaged between them.
Remember this — one plan, one budget, however many places you use it from.
Sources — Anthropic's usage and length limits article.
Sources
“Note that your usage of all different Claude product surfaces (claude.ai, Claude Code, Claude Desktop) counts towards the same usage limit.”
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