I am a fresh about PXC.i wonder if i can deploy a cluster across three datacenters.for example:nodeA in clusterA,nodeB in clusterB,nodeC in clusterC.the lantency of dcA and dcB is low because they are in the same city.dataC is far away from them.nodeA and nodeB both provide write and read,nodeC only a full backup and vote to nodeA or nodeB to decide which one is the donater which never provide write or read.nodeA synchronize with nodeB,nodeC asynchronize with nodeA and nodeB.And the donater only be nodeA or nodeB. IF IS IT POSSIBLE AND HOW TO CONFIG. THANKS VERY MUCH.