$2\mathrm{.}2-13$ Cookies. What is the purpose of a cookie value in the HTTP GET request?

The cookie value encodes the format of the reply preferred by the client in the response to this GET request.

The cookie value indicates whether the user wants to use HTTP$/1,$ HTTP$/1\mathrm{.}1,$ or HTTP$/2$ for this GET request.

The cookie value encodes a default set of preferences that the user has previously specified for this web site.

The cookie value is an encoding of a user email address associated with the GET request.

The cookie value itself doesn't mean anything. It is just a value that was returned by a web server to this client during an earlier interaction.