A display port cable to HDMI if you have a MacBook portable, otherwise HDMI 2.0 should work.
Get the one that Apple sells: https://www.apple.com/shop/product/HHLZ2ZM/B/belkin-4k-mini-displayport-to-hdmi-cable-4-m-13-ft
That way if you have trouble with it, Apple will support you.
Thanks but I am looking for a Displayport to HDMI cable/adapter, not the mini one.
Try amazon they all work....best if you can find from apple if they sell it.
You mean those HDMI cables under Amazon brand? I think they have over 1K reviews!