Match the communication networks with their structure:
| Communication Network | Structure | ||
| A | Single Chain | i | Central figure communication |
| B | Wheel | ii | Level-by-level communication |
| C | Circular | iii | Open interaction |
| D | Free Flow | iv | Adjacent communication |
1
A-ii, B-iii, C-i, D-iv
2
A-ii, B-i, C-iv, D-iii
3
A-i, B-iv, C-ii, D-iii
4
A-iv, B-ii, C-iii, D-i