Architecture question I'm having trouble finding an answer to:

I run four WordPress websites. I have mysql setup in a write master/read 
replica slave configuration on Amazon. There is one master that all the 
WordPress instances write to. I'm trying to figure out how to setup the read 
replicas.

Should I:

A. Give each WordPress instance it's own read replica?

or

B. Have all the WordPress instances use all the read replicas?

I have done A before, and it works fine. But by going with B I can consolidate, 
use beefier hardware and save money.

Any thoughts?
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