The type of approach to labor relations that best describes Amazon, given its history of actively opposing unionization and its preference to resolve issues directly with employees, would be:
d. Unitary Approach
The unitary approach emphasizes a single focus on the organization, where management and employees are seen as having common interests. In this approach, management typically views unions as unnecessary and believes that it can resolve employment issues directly without third-party involvement. This aligns with Amazon's stance on unionization.