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:
| Channel | Definition | Organisation | Ownership | Notes |
| --- | --- | --- | --- | --- |
| ABC1 | HD | Australian Broadcasting Corporation | Government |  |
| ABC2 | SD | Australian Broadcasting Corporation | Government |  |
| ABC3 | SD | Australian Broadcasting Commission | Government |  |
| ABC News 24 | HD | Australian Broadcasting Commission | Government |  |
| SBS One | SD | Special Broadcasting Service | Government | Simulcast in high definition on SBS HD |
| SBS Two | SD | Special Broadcasting Service | Government |  |
| 7 | SD | Seven Queensland | Private | Regional affiliate of the Seven Network in Brisbane |
| 7Two | SD | Seven Network | Private |  |
| 7mate | SD | Seven Network | Private |  |
| 9 | SD | WIN Television | Private | Regional affiliate of the Nine Network in Brisbane |
| Nine HD | HD | Nine Network | Private |  |
| GO | SD | Nine Network | Private |  |
| GEM | SD | Nine Network | Private |  |
| 10 | SD | Southern Cross Ten | Private | Regional affiliate of Network Ten |
| One HD | HD | Network Ten | Private |  |
| Eleven | SD | Network Ten | Private |  |
Question:
how many channels are in hd?
Answer:
4