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:
| Name | Current version | System | Platform | License |
| --- | --- | --- | --- | --- |
| Atari800 | 3.0.0 | Atari 5200 , various Atari 8-bit computers | Cross-platform | GPL |
| Altirra | 2.30 | Atari 5200 , various Atari 8-bit computers | Windows | GPL |
| Atari++ | 1.72 | Atari 5200 , various Atari 8-bit computers | Cross-platform | GPL |
| Rainbow | 2.2 | Atari 5200 , various Atari 8-bit computers | Windows, Mac OS, OS X | Freeware |
| kat5200 | 0.6.2 | Atari 5200 , various Atari 8-bit computers | Windows | GPL |
Question:
What is the System when the Licence is gpl and the Current Version is 1.72?
Answer:
Atari 5200 , various Atari 8-bit computers