Refer to the exhibit.
Which OSPF routers are the only routers that may perform summarization with the current network layout?
| A. |
Router 2 | |
| B. |
Router 3 | |
| C. |
Router 4 | |
| D. |
Router 5 | |
| E. |
Router 7 | |
| F. |
Router 8 |