You need to prepare an ArcGIS Online hosted feature layer that will be used to collect fire hydrant maintenance data using the Collector for ArcGIS mobile app. You would like Collector to display a drop-down menu of valid choices for the hydrant manufacturer attribute so that data can be entered with just a couple of taps, as pictured. How would you do this?

ArcGIS is a family of client, server and online geographic information system software developed and maintained by Esri. It is use to make maps and to analyze data. ArcGIS is free for noncommercial use.