What is Diret Traffic in Google Analytics?

Question $9$ options:

A$)$

The visitors know you and are familiar with your site. They searched for your website in the search engine and click on the retrieved URL.

B$)$

The visitors know you and are familiar with your site. They typed your URL into their browser or bothered to bookmark you.

C$)$

None

D$)$

The visitors know you and are familiar with your site. These visitors come on a link from a website.