How can the Architect ensure that only support representatives can access a private key in a managed package while preventing partners from doing so?

The correct choice revolves around utilizing a static variable in a class included in the managed package because it efficiently restricts access to the data while maintaining usability. When the key is stored in a static variable, it is encapsulated within the class, ensuring that it cannot be accessed directly from outside the managed package, such as by partners or other external users. The managed package provides a boundary that contains its components, thereby limiting visibility.

This approach leverages the encapsulation features of Apex, ensuring that only the classes defined within the package can utilize this static key. It allows the support representatives, who have access to the managed package classes, to retrieve the key securely without exposing it to unauthorized users or partners.

Other options, like storing the key in custom settings or objects, don't provide the same level of security. For instance, custom settings can be accessed by users with broader permissions, potentially allowing partners to reach sensitive data if they have appropriate access to the settings. Similarly, while an encrypted field on a custom object can secure data at rest, it may still not provide fine-grained access control, as partners could potentially be granted access to that object depending on the sharing rules in place.

Therefore, utilizing a static variable in a class restricts access to the