How would unicellular organisms procreate exactly?!
I am not being pedantic here but procreation usually entails sexual reproduction and I don't see how this is possible for these organisms.
1) Multiplying: Asexual reproduction only.
2) Reproduction: Sexual and asexual reproduction.
3) Procreation: Sexual reproduction only.
BTW: I don't see how 'multiplying' could refer to just asexual reproduction. People often use it in sentences like 'the deer population near here multiplied the last couple years'.
As you can see, getting terminology right is challenging and not always straightforward.