If User B changes User A's team member access to the ACME account, what is the impact of this change?

The correct answer is that the changes affect only the ACME Account. When User B changes User A's team member access to a specific account, such as the ACME account, that action is localized to just that account and does not impact any other accounts or team structures.

In Salesforce, teams are managed at both the account and object level, meaning that changing a team member's access for a particular account will only modify permissions or visibility for that specific instance. This ensures that other accounts, opportunities, or child accounts remain unaffected by changes made in this context, thereby providing both security and data integrity.

Other options are not relevant in this scenario because changes to team access for a specific account do not influence default team settings or other accounts unless explicitly stated or configured to do so. The localized nature of access management allows organizations to maintain precision in sharing data and ensures that users' permissions are tailored to the specific needs of individual accounts.