An engineer manages an OSPFv2 network where area 10 contains the subnets 172.16.16.0/24, 172.16.17.0/24, 172.16.18.0/24, and 172.16.19.0/24. To reduce the size of the routing table in area 0, the engineer wants R1 (the ABR connecting area 10 to area 0) to advertise a single summary route for these subnets into the backbone. Which command should be applied on R1 to accomplish this?