Windows 2012 R2 -- multiple DC upgrades ?

I have three sites and three DCs

Which of the below options do
you recommend for site #1 and why ?
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Option #1
 1. install new Windows 2012 R2 server
 2. demote old server
 3. change other two sites so AD
    replicates to this new name/IP
 4. wait a few weeks, repeat for site #2
 5. wait a few weeks, repeat for site #3
=========================================
Option #2
 1. install new Windows 2012 R2 server
 2. demote old server
 3. change new server name/IP to match old info
 4. change NOTHING at other two sites since
    AD replication will continue to work
 5. wait a few weeks, repeat for site #2
 6. wait a few weeks, repeat for site #3