Final Answer:
To allow the link to work, the Status of the associated record on the Application Restricted Caller Access list must be set to Allowed (Option 3).
Step-by-step explanation:
Application Restricted Caller Access List: This is a security feature that controls access to records associated with an application. Setting the Status to Allowed allows external systems or applications to access and interact with the associated records.
Denied vs. Allowed: If the Status is set to Denied, it restricts external access, potentially preventing the link from working. Conversely, setting it to Allowed grants the necessary permissions for external systems to utilize the link.
Custom ACL or Scope Changes: Options 2 and 4 are not directly related to the Application Restricted Caller Access List. Creating a custom ACL or changing scope might address different security aspects but may not specifically impact the link's functionality.
Option 3 is the answer.