D,a,b,b,a,d is the answer
The <span>corpus callosum contains about 200 million axons.</span>
HTML5
HTML5 has fewer plug-ins like the ability to standardize how audio and video are presented on a Web page. It introduces the <video> element designed to remove the need to install 3rd party add-ons and plug-ins like adobe flash player. It also adds the <audio> element too that allows pages to smoothly add audio files.
The term that best describes this would be called computer files and or organization file
