Which of the following tends to occur, which is often helpful in identifying bottlenecks?

Which of the following tends to occur, which is often helpful in identifying bottlenecks?

Starvation occurs before and after the bottleneck

Starvation occurs before the bottleneck; blocking occurs after the bottleneck

Blocking occurs before the bottleneck; starvation occurs after the bottleneck

Blocking occurs before and after the bottleneck