Final answer:
Employee engagement survey results, average cost per hire, and number of positions filled per month are metrics of HR program effectiveness.
Step-by-step explanation:
One metric of HR program effectiveness is the employee engagement survey results. These surveys measure the level of employee satisfaction, commitment, and motivation within an organization, which can indicate the effectiveness of HR programs in promoting a positive work environment.
Other metrics mentioned in the options include the average cost per hire and the number of positions filled per month. These metrics can provide insights into the efficiency and effectiveness of HR recruitment and hiring processes.
However, the number of open positions in a business unit alone may not be a direct measure of HR program effectiveness. It can be influenced by various factors such as market demand, organizational growth, and turnover rates.