The diagram illustrates a section of the circulation system of a mammal. In which location are both the blood pressure and the flow speed at their lowest?
- Alowest blood pressure: 1, lowest speed of flow: 4
- Blowest blood pressure: 2, lowest speed of flow: 3
- Clowest blood pressure: 3, lowest speed of flow: 2
- Dlowest blood pressure: 4, lowest speed of flow: 1