Explanation:

- Option 1: ISO cost curve

- Represents various combinations of products that cost the same amount.

- It is used in production and budgeting.

- Option 2: Indifference curve

Shows various combinations of two products that give the same amount of satisfaction.

- Used in consumer preference and utility analysis.

- Option 3: Marginal utility curve

- Illustrates how the additional satisfaction (utility) decreases as you consume more of a product.

- Focuses on changes in utility rather than total satisfaction levels.

- Option 4: ISO quant

- Represents combinations of inputs that produce the same level of output.

- Used in production theory.