For questions 2&3, I recommend you Google those and come back to the forum if you find answers you can't seem to grasp.

Question 1 - either you took down the info incorrectly or it was a "trick" question that unfortunately you failed. Oltp and olap are four letter acronyms, which again if you Google them will give you vast volumes of description. Oledb is a driver technology, used for accessing data in a database ( ie part of the plumbing)