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You’re both technically correct!
The AK 5D is a shortened version of the AK 5, however the AK 5C is also technically a shortened version of it. The C model is newer though and has some new features like a top picatinny rail, new handguard and stock, bolt-hold-open on last shot, an aimpoint sight and only one gas mode.
If I’m not mistaken there are also upgraded David models though.
Edit: Here’s a picture showing the [new David and Cesar versions](https://www.soldf.com/images/s_ak5c_ak5d.jpg) next to each other. And [here’s a picture](https://www.soldf.com/images/s_ak5_nykolv.jpg) showing the AK 5B (DMR version) compared to the original AK 5.