What option should an administrator select to ignore new constraints and keep previous ones when adding a user to a security role?

Selecting the option to "Do Not Modify" is the correct approach when an administrator wants to maintain the current constraints applied to a security role while adding a new user. This option signifies that the existing constraints will remain unchanged, effectively preserving the existing permissions and settings associated with the security role.

By choosing "Do Not Modify," the administrator ensures that no alterations are made to the current state of the security role's constraints, allowing for a seamless addition of the user without disrupting the established security protocols or permissions that have already been set. This option is particularly useful in environments where consistent access controls are critical, and changes could inadvertently lead to security vulnerabilities or access issues.

The other options offer different functionalities: "Append" would allow new constraints to be added alongside existing ones, potentially complicating the role with additional permissions. "Replace" would remove the current constraints and implement new ones, which may not align with the security needs of the organization. "Clear Existing" would erase all previous constraints, which is often not desirable when managing user roles, as it could lead to unintentional loss of crucial access settings.