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:
| Round | Circuit | Date | Class A Winner | Class B Winner | Class C Winner | Class D Winner |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Snetterton Motor Racing Circuit , Norfolk | 25 March | George 'Doc' Shepherd | Alan Hutcheson | None (no entries?) | Gawaine Baillie |
| 2.0 | Goodwood Circuit , West Sussex | 3 April | John Whitmore | Bill Blydenstein | Ellis Cuff-Miller | Mike Parkes |
| 3.0 | Aintree Motor Racing Circuit , Liverpool | 22 April | John Whitmore | Alan Hutcheson | Chris Kerrison? | Roy Salvadori |
| 4.0 | Silverstone Circuit , Northamptonshire | 6 May | Bill Aston | Peter Harper | Chris Kerrison? | Graham Hill |
| 5.0 | Crystal Palace , London | 22 May | George 'Doc' Shepherd | Bill Blydenstein | None (no entries) | Roy Salvadori |
| 6.0 | Silverstone Circuit , Northamptonshire | 8 July | Herbert Linge | Ellis Cuff-Miller | Chris Kerrison | Mike Parkes |
| 7.0 | Brands Hatch , Kent | 7 August | Frank Hamlin | Alan Hutcheson | Chris Kerrison | Mike Parkes |
| 8.0 | Oulton Park , Cheshire | 23 September | John Whitmore | Peter Harper | None (no entries?) | Roy Salvadori |
Question:
In which round did Roy Salvadori won Class D and Alan Hutcheson won Class B?
Answer:
3.0