Executing Show Slave 'A' status in server C.

              Connection_name: A
              Slave_SQL_State: 
               Slave_IO_State: Waiting for master to send event
                  Master_Host: A
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mariadb-bin.000008
          Read_Master_Log_Pos: 115323030
               Relay_Log_File: relay-bin-A.000002
                Relay_Log_Pos: 36464763
        Relay_Master_Log_File: mariadb-bin.000008
             Slave_IO_Running: Yes
            Slave_SQL_Running: No
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1950
                   Last_Error: An attempt was made to binlog GTID 2-2-950016 which would create an out-of-order sequence number with existing GTID 2-2-950016, and gtid strict mode is enabled.
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 115156622
              Relay_Log_Space: 36631468
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 1950
               Last_SQL_Error: An attempt was made to binlog GTID 2-2-950016 which would create an out-of-order sequence number with existing GTID 2-2-950016, and gtid strict mode is enabled.
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
                   Using_Gtid: Current_Pos
                  Gtid_IO_Pos: 1-1-3,2-2-950279,3-3-1
         Retried_transactions: 0
           Max_relay_log_size: 1073741824
         Executed_log_entries: 73389
    Slave_received_heartbeats: 0
       Slave_heartbeat_period: 1800.000
               Gtid_Slave_Pos: 1-1-3,2-2-950279,3-3-1