How can an architect ensure object-level security is enforced in a Visualforce Application that uses a custom Apex Controller?

In the context of enforcing object-level security in a Visualforce application that employs a custom Apex controller, selecting the method that checks access permissions directly is crucial. Using the Schema.DescribeSObjectResult isAccessible() method in the Apex controller serves this purpose effectively. This method can confirm whether the current user has permission to view a specific object, thus ensuring that the application adheres to the visibility and sharing rules defined in Salesforce.

By employing this method, the architect can programmatically verify access permissions before executing logic that interacts with the object. This approach not only reinforces security measures at the object level but also allows for dynamic checks based on the current user's permissions.

While other options may relate to the handling of security and permissions:

• The use of the "With Sharing" keyword in the Apex class enforces sharing rules for records, but it does not directly address object-level security.
• Defining the Visualforce page with "With Sharing" or "Without Sharing" does not impact object-level security checks; it deals more with record-level visibility.
• Using "Without Sharing" explicitly allows bypassing sharing rules, which is contrary to the intent of enforcing security.

Consequently, using Schema.DescribeSObjectResult isAccessible() in the Apex controller represents a