Final answer:
In the Case Designer, the b) Data Model tab is used to add or remove properties from a case type, helping manage the data structure to align with business requirements.
Step-by-step explanation:
To add or remove properties from your case type in the Case Designer, you should make use of the b) Data Model tab. Within the Case Designer, the Data Model tab is specifically designed for managing the structure of your data. This includes adding new properties, such as fields that you collect from your end users, and editing or deleting existing ones to ensure that the case type aligns with the business requirements.