Consider the following pairs:
| Major energy pipelines | Countries involved |
| 1. Keystone pipeline | USA-Mexico |
| 2. Power of Siberia | Russia-China |
| 3. Nordstream-I | Germany-Norway |
Which of the following pairs is/are correctly matched?
1
1, 2 and 3
2
1 and 3 only
3
1 and 2 only
4
2 only