Oki is short for okizeme. It's a term used in fighting games for the actions you perform when you score a knockdown and the opponent is waking up. Forced techs would be DOA's example of Oki.
Free Step Dodge
Tenryuga
Gill Hustle
Option Select is like creating a set up that covers 2 options example vid at 01:25 Mila goes foe CB combo but Christie does not CH and crumples giving Mila "option" for ground grab. As a Tina main you should be able to come up with a few: http://www.youtube.com/watch?v=b2WGijCynyI