Which of the following are considered to be product costs under variable costing? 
Definitions:
Vague Concepts
Ideas or notions that are not clearly defined or are lacking in precision and distinctness.
Scientific Methods
A systematic approach for conducting research, which involves observation, hypothesis formation, experimentation, and conclusion to establish empirical findings.
Ideal Self
A person's conception of how they would like to be or think they should be, often serving as a motivational guide for personal growth and development.
Actual Self
Represents an individual's perception of their own attributes and traits, reflecting who they currently are.
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