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:
| Edition | Round | Date | Against | Surface | Opponent | Result |
| --- | --- | --- | --- | --- | --- | --- |
| 2002 Fed Cup Europe/Africa Group I | RR | 24 April 2002 | Bulgaria | Clay | Desislava Topalova | 6–7 (4–7) , 1–6 |
| 2005 Fed Cup Europe/Africa Group III | RR | 26 April 2005 | Moldova | Clay | Ina Sireteanu | 6–1, 6–1 |
| 2005 Fed Cup Europe/Africa Group III | GIII Play-offs | 28 April 2005 | Bosnia and Herzegovina | Clay | Selma Babic | 6–3, 6–0 |
| 2007 Fed Cup Europe/Africa Group II | RR | 17–19 April 2007 | Bosnia and Herzegovina | Hard | Dijana Stojic | 6–3, 6–3 |
| 2007 Fed Cup Europe/Africa Group II | RR | 17–19 April 2007 | Georgia | Hard | Oksana Kalashnikova | 7–5, 6–4 |
| 2007 Fed Cup Europe/Africa Group II | RR | 17–19 April 2007 | Norway | Hard | Karoline Steiro | 6–2, 6–1 |
| 2007 Fed Cup Europe/Africa Group II | GII Play-offs | 20 April 2007 | Greece | Hard | Asimina Kaplani | 6–2, 6–1 |
| 2008 Fed Cup Europe/Africa Group I | RR | 30 January–3 February 2008 | Bulgaria | Carpet | Tsvetana Pironkova | 1–6, 0–6 |
| 2008 Fed Cup Europe/Africa Group I | RR | 30 January–3 February 2008 | Netherlands | Carpet | Arantxa Rus | 5–7, 4–6 |
| 2009 Fed Cup Europe/Africa Group II | RR | 22–24 April 2009 | Morocco | Hard | Nadia Lalami | 6–1, 6–0 |
| 2009 Fed Cup Europe/Africa Group II | RR | 22–24 April 2009 | Latvia | Hard | Irina Kuzmina | 6–2, 6–1 |
| 2009 Fed Cup Europe/Africa Group II | GII Play-offs | 25 April 2009 | South Africa | Hard | Lizaan du Plessis | 6–2, 6–3 |
| 2010 Fed Cup Europe/Africa Group I | RR | 4–5 February 2010 | Cratia | Hard | Ajla Tomljanović | 6–7 (6–8) , 4–6 |
| 2010 Fed Cup Europe/Africa Group I | RR | 4–5 February 2010 | Switzerland | Hard | Amra Sadikovic | 4–6, 1–6 |
| 2010 Fed Cup Europe/Africa Group I | GI Play-offs | 6 February 2010 | Bulgaria | Hard | Dia Evtimova | 1–6, 1–6 |
Question:
what is the surface when the opponent is selma babic?
Answer:
Clay