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DP83TC814S-Q1: what the different about link status in register indication of the datasheet

Part Number: DP83TC814S-Q1

I see the lots of link status indication in datasheet , what the different between them?  or which one I should use better to get the link status?

 

1:Register 0x0001,bit 2

2:Register 0x0010,bit 0 (duplicate register 0x0001,mentioned in datasheet)

3:Register 0x0133,bit 12

4:Register 0x1001,bit 2