Initial actions can be defined in
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main task only
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rule tasks and functions
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sub flow task
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any task in rule flow
Initial actions can be defined specifically in sub-flow tasks within a rule flow. They are not limited to main tasks only (option A), nor can they be defined in all task types (option D). Rule tasks and functions (option B) have their own specific action definition mechanisms.
In rule-flow/BPM style engines, 'initial actions' are actions executed at the very start of a task's execution before its main logic runs. This capability is tied to sub-flow tasks (tasks that invoke a nested/child rule flow), where an initial action sets up context or state for that sub-flow segment specifically. Main tasks, generic rule tasks, and functions don't carry this same 'initial action' hook in this framework's task model, which is why only the sub-flow task option is correct here.