Which one of the following is not included in 'hygiene' factors in the Herzberg two-factor theory of motivation?

Herzberg's two-factor theory distinguishes between hygiene factors (which prevent dissatisfaction) and motivators (which create satisfaction). Responsibility is a motivator, not a hygiene factor. Salary, working conditions, and company policy are classic hygiene factors - their absence causes dissatisfaction but their presence doesn't motivate. Responsibility, achievement, and growth are motivators that drive positive job satisfaction.