Exam ADM-201 topic 1 question 79 discussion

Chatter External This license is for users who are outside of your company’s email domain. These external users, also called customers, can be invited to Chatter groups that allow customers. Customers can access information and interact with users only in the groups they’re invited to. They have no access to Chatter objects or data. Chatter External users can view user profiles, but they can’t edit them.

Even if you have Chatter External, you need to create a private group to add customers.

If customer invitations are enabled for your organization, you can invite, add, and remove customers. It must be a private group that you own or manage and that allows customers. https://help.salesforce.com/s/articleView?id=sf.collab_external_adding.htm&type=5

FEATURE CHATTER EXTERNAL (ACCESS LIMITED TO ITEMS AND PEOPLE IN THE GROUPS CUSTOMERS ARE INVITED TO) Groups check icon indicating true https://help.salesforce.com/articleView?id=users_license_types_chatter.htm&type=5

False because - Customers can access information and interact with users only in the groups they’re invited to.

Public groups can’t have customers.

I'm afraid this answer is incorrect. chatter external license is usually for customers and non company employees.