Which MQ process is an indication that the Active instance is running in a multi-instance queue manager?

++ DETAILS
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a) Starting with MQ 9.3, these are the 4 processes running on the Standby instance:
Example from a test Linux box:
$ ps -ef | grep mq
mqm 101051 /opt/mqm/bin/amqzxma0 -m QMMI1 -x -u mqm amqzxma0
mqm 101061 /opt/mqm/bin/amqzfuma -m QMMI1  
mqm 101065 /opt/mqm/bin/amqzmgr0 -m QMMI1 
mqm 101068 /opt/mqm/bin/amqzmuc0 -m QMMI1 
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These processes are:
  amqzxma0   (Execution Controller or EC)
  amqzfuma   (OAM process)
  amqzmgr0     (Process controller)
  amqzmuc0     (Critical process manager)
.
Note: Prior to MQ 9.3 (that is, MQ 9.2 and earlier, there were only 2 processes)
mqm 3723 1    0 15:26 ? 00:00:00 amqzxma0 -m QMMI1 -x
mqm 3728 3723 0 15:26 ? 00:00:00 /opt/mqm/bin/amqzfuma -m QMMI1
.
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b) The following section of the online manual includes the specific order in which the MQ processes need to be manually killed (in case that endmqm does not work).
This task needs to be rarely done; but the reason that this information is included here, is to illustrate that the following process is in the list:
  amqzmur0    (Restartable process manager)

This amqzmur0 process is only found with the Active instance. 
The Standby instance does NOT have it.
Of course, during a failover/switchover from the Active to the Standby, then the amqzmur0 is started at the Standby, becoming the Active.
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https://www.ibm.com/docs/en/ibm-mq/9.4.x?topic=manually-stopping-queue-manager-aix-linux
IBM MQ / 9.4
Stopping a queue manager manually on UNIX and Linux