What is the focus of function allocation in system design?

Function allocation in system design primarily concerns determining how tasks and responsibilities should be divided between humans and machines. This involves analyzing the capabilities and limitations of both parties to ensure that each task is performed by the most suitable entity, thereby enhancing overall system performance and safety.

The choice that indicates job assignment between humans and machines captures this concept accurately, as it's essential to understand the strengths of each in terms of decision-making, physical capability, and cognitive workload. By appropriately allocating functions, designers can create more efficient and effective systems that optimize performance while ensuring user comfort and safety.

The other options, while relevant to various aspects of system design, do not encapsulate the specific focus of function allocation. Assigning tasks to humans deals more with human factors and ergonomics rather than the interplay between human and machine roles. Optimization of resources generally pertains to efficiency across a broader spectrum, not exclusively focusing on the division of labor between human and machines. Lastly, system validation is concerned with verifying that a system meets its requirements and performs as intended, which is quite different from the initial task assignment considerations central to function allocation.