According to Porter's classification of processes (i.e., Porters Value Chain model), classify the following processes and explain why they belong to the chosen categories.

1. The process for handling requests from employees to take their annual vacation
2. The process for reimbursing travel expenditures to employees when returning from a business travel
3. The process for handling customer complaints (complaint-to-resolution)
4. The process for producing the annual report of the company