After spending many hours at his computer workstation, Otswana experienced a sore back and neck and arm pain along with limited movement of his hands. What would be most effective in dealing with Otswana's situation?

A$.$ Get Otswana a different computer.

B$.$ Get a different light for Otswana.

C$.$ Encourage Otswana to get regular exercise outside the workplace.

D$.$ Have Otswana take short breaks and stretch every hour.