Final answer:
The correct security control for Peter to share US sales team opportunities with the US Support team is 'a. Sharing Rules'. These allow for specific sharing configurations beyond baseline security settings, facilitating the necessary collaboration between teams.
Step-by-step explanation:
We are addressing Peter's need to share US sales team opportunities with all US Support team members within a business context, likely involving a Customer Relationship Management (CRM) system.
The appropriate security control to use in this scenario is a. Sharing Rules. Sharing rules allow administrators to specify how records in a database can be shared beyond the standard security settings. In the case of Peter wanting to share records with the US sales team, the correct approach would be to set up sharing rules so that visibility of sales opportunities is extended to the US Support team members. This will enable collaboration between the two teams without changing the fundamental access permissions of individual users, which would be the case if permission sets or role hierarchies were modified.
It's important to note that organization-wide defaults set the baseline access level for records within the CRM, and if they are set too restrictively, sharing rules can be used to extend access to additional groups or roles within the organization. Thus, sharing rules provide a flexible way to cater to specific sharing needs without compromising overall data security.