Final answer:
The default greeting option in Salesforce is typically managed by a Greeting Manager application, which is not a standard Salesforce app but rather a custom or third-party solution.
Step-by-step explanation:
To set the default greeting option in Salesforce, you would use the Greeting Manager. While Salesforce is a highly customizable platform, there is not a standard app called Salesforce Communication App, Marketing Cloud Configuration, or Distributed Marketing Settings that would control default greetings. Instead, Greeting Manager is typically a custom or third-party application that could be found on the Salesforce AppExchange or developed specifically for an organization to handle such configurations.