Northern Trail Outfitters is creating a distributable Salesforce package.

To securely integrate a distributed package with a central "Hub" org, the architect should utilize the OAuth 2.0 Web Server Flow. In this model, a Connected App is created in the central org to act as the identity and access provider.1

A critical component of this setup is the Callback URL (Redirect URI). When a user in the "Subscriber" org (where the packag2e is installed) initiates the connection, Salesforce redirects them to the central org to authorize the access. After successful authentication, the central org needs the correct callback URL to return the authorization code to the specific subscriber org.

Using this flow satisfies the security team's requirement for a specific integration account. The administrator in the central org can pre-authorize specific profiles or permission sets to use the Connected App, ensuring that only the designated integration user's credentials are used to fulfill requests. Option A is a security "anti-pattern" (storing passwords in fields), and Option C is unnecessary as API access is a standard feature. This OAuth-based approach provides a secure, revocable, and standardized way to manage cross-org communication in a multi-tenant environment.