[单选] While deploying a new switch，you accidently connect ports 3/12 and 3/18 together，creating a loop.STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）

A . Port 3/12 was already up and forwarding before the loop was created.
B . Port priority is based on lowest priority and lowest port number.
C . You connected the wire on port 3/18 last.
D . None of the above， it is purely random.

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[单选] While deploying a new switch，you accidently connect ports 3/12 and 3/18 together，creating a loop.STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）

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