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:
| Stage | Winner | General Classification | Points Classification | Mountains Classification | Metas Volantes Classification | Team Classification |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Alberto Contador | Alberto Contador | Alberto Contador | Egoi Martínez | Iban Mayoz | Saunier Duval-Scott |
| 2.0 | Kim Kirchen | Alberto Contador | David Herrero | Egoi Martínez | Iban Mayoz | Lampre |
| 3.0 | David Herrero | Alberto Contador | David Herrero | Egoi Martínez | Iban Mayoz | Saunier Duval-Scott |
| 4.0 | Kim Kirchen | Alberto Contador | David Herrero | Egoi Martínez | Iban Mayoz | Saunier Duval-Scott |
| 5.0 | Damiano Cunego | Alberto Contador | David Herrero | Egoi Martínez | Iban Mayoz | Karpin-Galicia |
| 6.0 | Alberto Contador | Alberto Contador | Damiano Cunego | Egoi Martínez | Iban Mayoz | Rabobank |
Question:
Who led the metas volantes classification for stage 4?
Answer:
Iban Mayoz