process builder questions

Hi all,

I am dealing with this question about how to implement the third part of the requirement:

1. If the following conditions are met, Type will be A

Category=Best AND No. of hotels > 20
OR
Category = Good AND Target Segment = Four stars
OR
Category = Medium AND Target Segment = Three stars

This is not difficult with a workflow or process builder.

2. If the following conditions are met, Type will be B:

Category=Best AND No. of hotels > 50
OR
Category = Good AND Target Segment = Two stars
OR
Category = Medium AND Target Segment = One star

Also already implemented with the process builder

3. If none of the conditions above apply, then Type is C

I see this part is difficult, because you have to find the intersection in all conditions or a combination of them in order to update the field Type to C.
The field Type is a picklist with the values A,B and C. When you see on the Account Layout you will also see the value "None" in the picklist.

I am not sure about how to be implement best the third part. Any suggestions?