【单选题】With respect to the World Wide Web, what is a cooki e?
A.
A software service to improve download speeds. The cookie archives commonly accessed data, so that you don't need to download it again.
B.
A text file stored on your computer by a web-server when you visit a site. Cookies are often used to enable automatic logins or customisations for webpages you have visited.
C.
A program that collects data from your computer. The cookie can then send the data to a remote server.
D.
A program left on your machine by a website you've visited, which tracks your intermet use. This is often used for targeting adverts.