1. Name the available custom field types.
   String, Boolean, Integer, Date, Decimal.
2. Name the available custom field scopes (the levels at which a custom field can be defined).
   Job, Page, Page Set, Page Position, Imposition Plan, Signature, Surface, Separation.
3. Why can each custom field at each different level of a job have a unique value?
   Custom fields are created and stored as arrays. This means that a string custom field called "myString" and assigned at job level can have a different value for every job.