An IP router implementing Classless Inter-domain Routing (CIDR) receives a packet with address 131.23.151.76. The router's routing table has the following entries:
Prefix |
Output Interface Identifier |
131.16.0.0/ 12 |
3 |
131.28.0.0/ 14 |
5 |
131.19.0.0/ 16 |
2 |
131.22.0.0/ 15 |
1 |
The identifier of the output interface on which this packet will be forwarded is ______.