Help me please

Consider the following production process. It is trying to meet a market demand of 250 units per week. Step 1 Step 2 Step 3 Step + Step 5 Step 6 Step 1: Material release schedule Step 2: Drilling (capacity is 300 units/week) Step 3: Tapping (capacity is 150 units/week) Step 4: Grinding (capacity is 300 units/week) Step 5: Coating (capacity is 200 units/week) Step 6: Inspection (capacity is 500 units/week) a. Where should buffers be placed? (3 points) b. Which resource is the drum? (3 points) c. Where should the rope be placed? (2 points) d. Which resource is the bottleneck? (3 points) e. Which resource is the CCR? (3 points)