Explanation:

- In the Marxist approach, the primary focus is on the broader exploitation and class struggle inherent in capitalist systems.

- Wage-related disputes, while important, are not central to the analysis.

- Option 1: Primary - This would imply wage disputes are the main focus, which isn't accurate in Marxist theory.

- Option 2: Secondary - Wage-related issues are considered but viewed as part of a larger systemic problem.

- Option 3: Tertiary - This would suggest an even lesser focus than secondary, which isn't entirely fitting.

- Option 4: Not considered - This would overlook any relevance wage disputes have in the discussion of capitalism.

Correct Answer: Option 2: Secondary