Hello, I want to know a couple of things about the 2017 iMac. 1- Is it possible to upgrade the RAM (8GB) to something higher in the 21.5" iMac? Is the RAM soldered? 2- Which 2017 iMac have the RAM soldered? 3- Is there a possibility to remove the HDD in the 21.5" and put a SSD ? 4- Is there a possibility to remove the HDD in Fusion Drive and put SSD? 5- Is there a possibility to remove the HDD in 27" and put a SSD? 6- I saw that we can remove the RAM thing and put new one just by opening the thing behind in the 27". Is it possible to do change RAM in 21.5" just by opening the thing behind like in the 27" or it has to be completely opened? I know all these information can be found on Google but I think it's a bit confusing and I'm unsure. Thank you and sorry for these noob questions.