In the OSPF broadcast network, there are 4 routers RTA, RTB, RTC and RTD in the same network segment, their priorities are 2, 1, 1 and 0 respectively, and the Router IDs are 192.168. 192.168.3.1 and 192.168.4.1. If the OSPF protocol is enabled on the four routers at the same time, the BDR selected by OSPF is _____.

{} [+]