What is the effect when loopback interfaces and the configured router ID are absent during the OSPF Process configuration?

What is the effect when loopback interfaces and the configured router ID are absent during the OSPF Process configuration?
A. The lowest IP address is incremented by 1 and selected as the router ID.
B. The router ID 0.0.0.0 is selected and placed in the OSPF process.
C. No router ID is set, and the OSPF protocol does not run.
D. The highest up/up physical interface IP address is selected as the router ID.

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