Multiple masters for slave zone

[eliran shlomo]

Hi,
I need help with understanding how multiple masters work.
i set for a slave zone few masters
zone "example.com" in {
        type slave;
        file "secondary/db.example.com";
        masters { 192.168.112.10; 192.168.112.12; 192.168.112.13;
192.168.112.14; 192.168.112.15; };
};

Each master is standalone and there's no handshake between them

Now my question is if i change the serial on 192.168.112.13 master, after
the notify from which one the zone transfer will occur?

bind version is Version: 9.5.0-P2
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