Which step must a developer take to add a new column field to the out$-$of$-$the$-$box Activity entity?

Edit the Activity.eti if it already exists

Create an Activity.etx file if one does not already exist

Create the Activity$\_$Ext.etx file if Activity.etx already exists

Create an Activity. eix file if one does not already exist

Create an Activity$\_$Ext.etx file if one does not already exist

Edit the Activity.eix file if it already exists