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:
| DVD Season | Format | # Episodes | # Disc(s) | Region 4 |
| --- | --- | --- | --- | --- |
| The Complete Season 1 | DVD | 22.0 | 6.0 | 2December2009 |
| The Complete Season 1 | Blu-ray | 22.0 | 6.0 | N/A |
| The Complete Season 2 | DVD | 22.0 | 6.0 | 3November2010 |
| The Complete Season 2 | Blu-ray | 22.0 | 6.0 | 3November2010 |
| The Complete Season 3 | DVD | 22.0 | 6.0 | 20April2011 |
| The Complete Season 3 | Blu-ray | 22.0 | 6.0 | N/A |
| Season 4: Part 1 | DVD | 11.0 | 3.0 | 3November2011 |
| Season 4: Part 1 | Blu-ray | 11.0 | 3.0 | N/A |
| Season 4: Part 2 | DVD | 11.0 | 3.0 | 28March2012 |
| Season 4: Part 2 | Blu-ray | 11.0 | 3.0 | N/A |
| The Complete Season 4 | DVD | 22.0 | 6.0 | 28March2012 |
| The Complete Season 4 | Blu-ray | 22.0 | 6.0 | N/A |
| The Complete Season 5 | DVD | 22.0 | 6.0 | 2May2013 |
| The Complete Season 5 | Blu-ray | 22.0 | 6.0 | N/A |
| The Complete Season 6 | DVD | 12.0 | 4.0 | 7November2013 |
| The Complete Season 6 | Blu-ray | 12.0 | 4.0 | N/A |
Question:
What was the format for the 4 disc season that had less than 22 episodes and n/a for region 4?
Answer:
Blu-ray