Ant+ or Bluetooth when connecting to Cycle Ops Hammer / Garmin Cadence

Hi,

Random question ... when I pair my Fenix 6 Sapphire to either my Cycleops Hammer or older Garmin Speed and Cadence sensor does it pair using Ant+ or bluetooth?  I'm assuming it is Ant+ is that correct?  Is there an option to choose one or the other?

Thanks