How can a System Administrator prevent users from selecting the Customer Record Type when creating new Account records?

Removing the Customer Record Type as an Assigned Record Type in the users' Profiles and Permission Sets is the most effective way to prevent users from selecting it when creating new Account records. By doing this, the System Administrator ensures that the Customer Record Type is not available to the specified users, effectively limiting their options and enforcing any necessary business rules.

When a Record Type is removed from a user's Profile or Permission Set, they will not see that Record Type as an option when creating new records, ensuring compliance with organizational policies or workflow requirements. This approach directly addresses the issue by managing user permissions related to Record Types at the profile level, making it a straightforward and enforceable solution.

Other methods, while potentially useful in different contexts, do not prevent the selection of the Customer Record Type as effectively. For instance, workflows and validation rules can influence record behavior after creation or rely on conditions being met, but the ideal solution for restricting access upfront lies in managing the assigned Record Types through profiles and permission sets.