Where does routing occur within the DoD TCP/IP reference model?

Where does routing occur within the DoD TCP/IP reference model?

A.
application

B.
internet

C.
network

D.
transport

Explanation:
This question is to examine the TCP/IP model.
TCP/IP model has four layers: Process/Application layer, Host-to-Host layer, Internet layer, Network Access layer. Routing occurs at the Internet layer.