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.