Final answer:
The correct command to display IPv4 routing protocol settings on a router is 'show ip protocols'. This command gives details on the dynamic routing protocols configured on the router.
Step-by-step explanation:
To display the IPv4 routing protocol settings currently configured on the router, the correct command to use is 'show ip protocols'. This command provides a detailed output of the dynamic routing protocols that are configured on the router, such as RIP, OSPF, or EIGRP, and their current status.
It's important to understand that this command focuses on the routing protocols themselves and not the actual routing table or interface statistics which are shown by different commands.