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:
| Home team | Home team score | Away team | Away team score | Ground | Crowd | Date |
| --- | --- | --- | --- | --- | --- | --- |
| St Kilda | 16.13 (109) | Melbourne | 5.11 (41) | Colonial Stadium | 13814.0 | Friday, 15 February |
| Fremantle | 13.9 (87) | Western Bulldogs | 10.8 (68) | Subiaco Oval | 13304.0 | Friday, 15 February |
| Geelong | 12.7 (79) | Richmond | 7.13 (55) | Baytec Stadium | 11531.0 | Saturday, 16 February |
| Carlton | 12.9 (81) | West Coast | 17.14 (116) | Optus Oval | 5217.0 | Saturday, 16 February |
| Brisbane Lions | 14.7 (91) | Adelaide | 14.9 (93) | Gabba | 17236.0 | Saturday, 16 February |
| Hawthorn | 13.10 (88) | Kangaroos | 11.10 (76) | York Park | 12861.0 | Sunday, 17 February |
| Sydney | 18.11 (119) | Collingwood | 5.9 (39) | Manuka Oval | 7826.0 | Sunday, 17 February |
Question:
Where did the team play when the home team score was 12.9 (81)?
Answer:
Optus Oval