I cannot find the Chip Select pin on the Xiao nRF52840 board

Products & Technology XIAO
#1

Hello,
I am trying to connect my nRF52840 board to a micro SD reader, but I cannot seem to find the CS pin.
Would you know which pin is the CS/SS ?

Thank you very much!

#2

Any pin can be used as CS.

#3

Thank you @msfujino !