About the description about the OSPF calculating the shortest path tree stage, which is the correct?

About the description about the OSPF calculating the shortest path tree stage, which is the correct?
A .  The first stage calculates the Stub network segment, and the second stage calculates the router node and Transit network segment.
B .  The first stage calculates routing nodes and Transit network segments, and the second stage calculates Stub network segments.
C .  The first stage calculates the stub segment, and the second stage calculates the routing node.
D .  The first stage calculates the routing nodes, and the second stage calculates the Stub network segment.

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Answer: B