What is the most likely mechanism for the reaction below? 
Definitions:
Periodic Task
A task that is scheduled to run or execute at regular intervals.
Programs
Instructions written in a programming language that a computer or device executes to perform specific tasks.
Task
A specific piece of work or operation to be performed, often part of a larger process or system functionality.
Priority Task
A task given preferential execution over other tasks in a computing environment, based on urgency or importance.
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