Spanning-Tree Root Port Election with HUB

Dear all,
In this case , Switch A will select Port 2/1 as the root port , but what is the tie break in this senario using.
As I know , root port election is as below
1. lowest Root Path Cost
2. Choose lowest upstream BID
3. Choose lowest upstream Port ID

It seems the there is no match anything above.
So I guess the final tie-break is the local port ID.

Can anyone give me some advice? thanks!!

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