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:
| Date | Label | Region | Format | Catalog |
| --- | --- | --- | --- | --- |
| 4 April 1988 | Polydor | France, Belgium, Switzerland | 7" single | 887 448-7 |
| 4 April 1988 | Polydor | France, Belgium, Switzerland | 7" maxi | 887 448-1 |
| 4 April 1988 | Polydor | France, Belgium, Switzerland | CD maxi | 887 448-2 |
| 4 April 1988 | Polydor | France, Belgium, Switzerland | CD video | 080 360-2 |
| June 1990 | Polydor | Japon | CD maxi | PODP-1010 |
| 20 August 1997 | Polydor | France, Belgium, Switzerland | CD single | 571 436-2 |
| 20 August 1997 | Polydor | France, Belgium, Switzerland | CD single - Promo | 3620 |
Question:
What label has cd single as the format?
Answer:
Polydor