cactus id Greenhouse Botanical Garden of Antwerp (3)

[ohugal]

Hi Everyone,

I would like some advice on the following cacti:

IMG_0785 kopie.JPG (75.05 KiB) Viewed 236 times

IMG_0785.JPG (164.42 KiB) Viewed 236 times

IMG_0797 kopie.JPG (134.27 KiB) Viewed 236 times

IMG_0797.JPG (200.35 KiB) Viewed 236 times

IMG_0782.JPG (172.52 KiB) Viewed 236 times

The first one looks like a Pilosocereus, but I've looked on LLIFLE and in my books and can't really pinpoint a species.
The second one, I don't know. Maybe a Rebutia? I have no experience with them.
The third plant reminds me of an Oreocereus, although I have no knowledge of any 'crawling' varieties.
Any help is welcome. Thanks in advance!