That isn't a ballerina bun though. That is just a neat bun. A ballerina bun is a bun that sits in a direct line with the face, tied very tight and close to the head, often pinned down and a net is used to keep it all in place.
None of those are "quick" xD the first one takes forever and the second and third one require hair donuts or socks which also take forever. My go to hair styles are the half up bun : encrypted-tbn2.gstatic.com/images