Upon further experimentation, I think the question boils down to:
What do you enter into the IF statement “enter value” field to:
a) Specify the contents of the array
– Can specify a singular value “Option 1” but not multiple “Option 1, Option 2” or is the syntax incorrect? nothing in Forums/documentation about this.
b) Specify an empty array
– At the moment [Equal To “blank”] AND [Not Equal To “blank”] both return true irrespective of which boxes are ticked