What do staff members need to do in order to work overtime?

Câu hỏi :

Question 86 - 87 refer to following paragraph:
Date: Tuesday, Oct. 15
To: All employees
Re: Painting
This weekend, the office will be closed for painting, and no employees will be allowed in the building. Although official company policy discourages employees from working overtime hours from home, an exception will be made in this case. However, you should be sure to get prior approval for your overtime from your manager. Also, log on to the system from home when you start work, and remember to log off when you are finished. The painters will be here on Saturday morning, and they have requested that all office furniture be moved into the hallway. So, you are asked to leave work at 5:00 on Friday to give the maintenance staff a chance to rearrange the furniture. Your cooperation is appreciated.
Thank you
86. What do staff members need to do in order to work overtime?