What Is Sent Over HTTP, If User Enters Non-ASCII Characters

What is sent over HTTP, if user enters non-ASCII characters into the address window of a Web browser (e.g. the URL address shown in the image) ?

A) The UTF-16 representation of these characters is being sent, since HTTP supports Unicode
B) The special characters are Base64 encoded before sending
C) URL address contains sequence of the form %HH%HH%HH, where "HH" is a hex-encoding of bytes representing the non-ASCII characters
D) Special characters are sent as bytes, using the current encoding of the Web page