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:
| Region | Date | Label | Format | Catalog |
| --- | --- | --- | --- | --- |
| Australia | September 20, 2008 | Rough Trade Records | CD | RTRADCD491 |
| United Kingdom | September 22, 2008 | Rough Trade Records | CD | RTRADCD491 |
| United Kingdom | September 22, 2008 | Rough Trade Records | LP | RTRADLP491 |
| United States | September 23, 2008 | Warner Bros. Records | CD | 508668 |
| United States | September 23, 2008 | Warner Bros. Records | LP | 508668 |
| Hong Kong | September 26, 2008 | Rough Trade Records | CD | RTRADCD491 |
| Canada | September 30, 2008 | Warner Music Canada | CD | 2508668 |
| Japan | November 26, 2008 | Warner Music Group | CD | WPCB10098 |
Question:
What is the Format of the release with Catalog number 2508668?
Answer:
CD