In a discretionary access control model, what does the owner of an object do?

In a discretionary access control (DAC) model, the owner of an object has the authority to define who may access that specific object. This is a core principle of DAC, where access permissions are determined by the owner rather than a centralized authority. The owner's ability to grant or deny access is flexible and can be tailored according to specific needs or relationships with users.

The owner can make decisions about which users or groups can read, write, or execute the object based on their discretion, allowing for a high degree of personal control over the resources. This model is commonly used in various operating systems and applications where the flexibility of access control is needed.

In contrast, other choices imply a more rigid or automated solution to access control that isn’t characteristic of DAC. For example, revoking access from all users lacks the nuanced control an owner would exercise, global rules suggest a centralized approach found in models like mandatory access control, and automated protocols do not reflect the owner’s personal discretion at all.