Final answer:
Open questioning aims to gather information and build rapport, not limit expression.
Step-by-step explanation:
The function of open questioning when dealing with a customer is not to limit the customer's ability to express their thoughts. Instead, open questions are designed to gather specific information, encourage detailed responses, and build rapport and trust with the customer. Open-ended questions allow customers to provide more context and detail, which leads to qualitative data that can be valuable for understanding customer needs and improving services or products.