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Correct answer: D. Form mode, where the client collects structured data, and URL mode, where the user opens a link.
Explanation
The principle — The two modes differ by where the answer travels, not by how it looks.
Why the key is correct — Form mode: The server asks the client to collect structured data from the user. URL mode: The server provides a URL for the user to open.
Why the others are wrong — There is more than one mode. The second is not a fallback for rendering trouble. And the mode is requested by the server rather than picked by the client for layout reasons.
Remember this — Form mode goes through the client; URL mode goes around it.
Sources — MCP first-party documentation.
Sources
“Form mode: The server asks the client to collect structured data from the user.”
“URL mode: The server provides a URL for the user to open.”
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