正解:
See explanation below.
Explanation
You need to assign the duty 'Approve employee leave requests' to the human resources managers.
Navigate to System Administration > Security > Security Configuration
On the Roles tab, select the Human Resources Manager role.
Click on Duties then click on Add references.
In the References section, click on Duties. This will list all the available duties.
Select the Approve employee leave requests duty to add it to the role.