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:
| Title | Release date | Format | Code | UK Singles Chart | US Modern Rock | Album |
| --- | --- | --- | --- | --- | --- | --- |
| Mad Love EP | 26 February 1990 | 12"/CD/C | BAD 0003 | 55 | – | – |
| "Sweetness and Light" | 15 October 1990 | 7"/12"/CD/C | BAD 0013 | 47 | 4 | Gala |
| "De-Luxe" | March 1991 | Radio promo CD | PRO-CD-4662 | – | 14 | Gala |
| "Nothing Natural"/Black Spring EP | 7 October 1991 | 7"/C//12"/CD | BAD 1016 | 43 | – | Spooky |
| "Nothing Natural" | 29 October 1991 | CD | 9 40231-2 (US only) | – | 22 | Spooky |
| "For Love" | 30 December 1991 | 10"/12"/CD/C | BAD 2001 | 35 | 9 | Spooky |
| "Superblast!" | February 1992 | Radio promo CD | PRO-CD-5471 | – | – | Spooky |
| "Hypocrite" | 30 May 1994 | 7"/12"/CD | BAD 4008 | 52 | – | Split |
| "Desire Lines" | 30 May 1994 | 7"/12"/CD | BAD 4010 | 60 | – | Split |
| "Single Girl" | 8 January 1996 | 7"/2xCD 1 | BAD 6001 | 21 | – | Lovelife |
| "Ladykillers" | 26 February 1996 | 7"/2xCD 1 | BAD 6002 | 22 | 18 | Lovelife |
| "500 (Shake Baby Shake)" | 15 July 1996 | 7"/2xCD 1 | BAD 6009 | 21 | – | Lovelife |
Question:
What is the format of code 9 40231-2 (us only)?
Answer:
CD