Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Res. | Record | Opponent | Method | Event | Round | Time |
| --- | --- | --- | --- | --- | --- | --- |
| Win | 17-3 | Carlo Prater | Decision (split) | Shine: Lightweight Grand Prix | 3.0 | 5:00 |
| Loss | 16-3 | Dave Jansen | Decision (unanimous) | WEC 43 | 3.0 | 5:00 |
| Win | 16-2 | Sergio Gomez | Decision (unanimous) | WEC 33 | 3.0 | 5:00 |
| Loss | 15-2 | Rob McCullough | TKO (punches) | WEC 30 | 1.0 | 1:29 |
| Win | 15-1 | Mike Joy | Submission (brabo choke) | WEC 25 | 3.0 | 4:23 |
| Win | 14-1 | Adam Lynn | Submission (rear naked choke) | WEC 21 | 2.0 | 1:20 |
| Win | 13-1 | Nick Ertl | TKO (strikes) | WEC 18 | 2.0 | 3:55 |
| Win | 12-1 | James Martinez | TKO | Freedom Fight - Canada vs USA | 1.0 | 3:31 |
| Win | 11-1 | Paul Jenkins | KO | WEC 15 | 2.0 | 2:36 |
| Win | 10-1 | Peter Kaljevic | Submission (armbar) | RFC 1 - Real Fighting Championships 1 | 1.0 | 3:44 |
| Loss | 9-1 | Hermes França | Decision (unanimous) | UFC 42 | 3.0 | 5:00 |
| Win | 9-0 | Víctor Estrada | Submission (ankle injury) | WEC 5 | 1.0 | 1:13 |
| Win | 8-0 | Luciano Oliveira | Submission (armbar) | WEC 4 | 1.0 | 1:55 |
| Win | 7-0 | Cruz Gomez | TKO | WEC 3 | 1.0 | 3:04 |
| Win | 6-0 | Bao Quach | KO | UA 2 - The Gathering | 2.0 | 1:20 |
| Win | 5-0 | Aaron Jerome | TKO | RITR - Rumble in the Rockies | 1.0 | 1:00 |
| Win | 4-0 | Eric Hibler | Decision | RSF 1 - Redemption in the Valley | 3.0 | 4:00 |
| Win | 3-0 | Scott Johnson | Submission (knee bar) | WVF - Battlejax | 1.0 | 5:19 |
| Win | 2-0 | Robert Irizarry | Decision (unanimous) | WEF - New Blood Conflict | 3.0 | 3:00 |
| Win | 1-0 | Ray Totorico | TKO (strikes) | WEF 7 - Stomp in the Swamp | 2.0 | 2:24 |
Question:
What opponent used the Ko method, and a 6-0 record?
Answer:
Bao Quach