My current printer has 2 Cartridges, Black and Colour.
I'm considering buying a New printer.
But this New printer has CYMK 4 Cartridges.
When the printer needs to be refilled with new cartridges, must all the four be refilled?
Because I understand that some are optional??
I have searched on Google, but I can't find which of the C, Y, M and K Cartridges are optional.
So my question is, which of the C, Y, M and K Cartridges are optional to buy and to be refilled when it's empty?
K of CYMK is Black colour, so I know that at least the K Cartridge is compulsory.