Linn Direktor / Unik Speaker Cable upgrade

I am trying to build a simplied audio system.

I have acquired a Linn knekt Room Amp, a Linn Direktor and 2 Unik Speakers. I will either keep the direktor or the knekt according to taste.

I am aware it is "very basic" but looking now for speaker cables

So what would be an optimal choice for speaker cable (length underneath 3m) as an upgrade path when the amp changes to an LK100/Wakonda combo.

a) K20
b) K40
c) K400 sliced for K200 mode
d) Naim NAC A5
e) OR Your recommendation wich would be:

Thank you