Leo is a human resource specialist at a company with a promote-from-within policy. Based on that policy, what method should he include in his recruiting efforts to fill an open position for an accounting supervisor

posting the job on the company's intranet

Explanation:

Someone with 'promote-from-within' policy tend to prioritize the advancement of their current team members over the people from outside. They tend to believe that members who have embodied the company's culture and prove their loyalty to the company should be presented with the biggest chance to obtain high position in the company.

This is why they are more likely to use company's intranet when posting an open position for supervisor. Unlike normal website, company's intranet could only be accessed company's team members and staffs. No one outside the company will get the chance to see the post.