A playbook task is set up to run an integration command that takes no input...

When an integration has multiple instances configured, XSOAR’s playbook engine attempts to execute the command once per available instance unless directed otherwise. This behavior is described in the Playbook Task Execution Model within the Admin Guide. To prevent multiple executions, the engineer must explicitly specify which integration instance the command should use.

Playbook tasks include a "Using" drop-down (the “using=” parameter in CLI form), which binds the task to a particular instance. Once set, XSOAR will run the command only on that selected instance, ensuring it does not loop through all available instances.

The limits settings in Advanced Options or Performance sections control retry behavior or error handling, not instance selection. The “runlimit” parameter is used for limiting iterative loops or repeated command execution inside playbooks, not for controlling multi-instance execution.

Thus, to ensure the integration command executes only once, the engineer must specify the using=instance_name, making option A the correct answer.