AR2412 - How to connect XLR Output to unbalanced Input safely?

Hi!
I want to connect a XLR output of the stagebox AR2412 to a device (headphone amp) with unbalanced input.
Since both devices are nearby, cables will be short and I want to use direct wiring (without any devices between).

What is the safest/best way to do this?

A) Do not solder pin 3 of XLR (leave it in the air).

B) Solder pin 3 to pin 1.

C) ???