Which of the following inputs into the sales and operations planning process is from the human resources function?

Machine capacity refers to the maximum output that machinery can produce over a given period. This metric is determined by equipment capabilities and operational efficiencies, rather than human resources. It falls under the domain of production planning rather than human resources.

Product features relate to the design, functionality, and specifications of a product. This input is typically derived from product development and marketing teams, focusing on consumer needs and preferences rather than human resource considerations. Hence, it is not an input from the human resources function.

Cost data encompasses the financial aspects associated with production, including materials, labor, and overhead. While labor costs may involve input from the human resources function, cost data as a whole is broader and encompasses various departments, including finance and accounting, making it not exclusive to human resources.