Classify the following activities into 5 levels: Unit-level (U), Batch-level (B), Product-level (P), Customer-level (C) and organization-sustaining (OS) activities. Receiving raw materials from suppliers Moving materials from the warehouse to production lines Designing new products (done by product engineers) Inspecting completed units for quality control (every unit is examined) Inspecting completed units for quality control (sampling) Performing periodic preventive maintenance on general-use equipment Assembling products (done by assembly workers) Preparation of quarterly financial reports. Filling the machine with a colour dye (product comes in different colours) Generating monthly statements for regular credit customers Interview and process new employees in the HR department