To answer this question, you need to understand the components of a GET request.

A GET request is an HTTP request method used to retrieve data from a server. It consists of several parts, including the headers and the query string.

The correct answer is B) Query Strings.

Query strings are a part of the URL that contains data to be sent to the server as part of the GET request. They are appended to the URL after a question mark '?' and consist of key-value pairs separated by an ampersand '&'.

For example, in the URL "http://example.com/path?param1=value1&param2=value2", the query string is "param1=value1&param2=value2". The server will log the query string as it contains the additional data sent with the GET request.

Option A) Hidden tags - This option is incorrect because hidden tags are HTML elements used to store data on the client-side, not part of the GET request sent to the server.

Option C) Header - This option is incorrect because while the server logs the headers of the request, the query string is a separate part of the GET request and is not considered a header.

Option D) Cookies - This option is incorrect because cookies are also separate from the GET request and are stored on the client-side. The server may log information about cookies, but it is not specifically part of the GET request.

Therefore, the correct answer is B) Query Strings.

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