Conduct a budget analysis for Company D's upcoming fiscal year using zero-based budgeting (ZBB) principles.

Requirements:

1. Prepare a ZBB budget for each department, starting from scratch and justifying every expense.
2. Include fixed costs, variable costs, and discretionary expenses for each department.
3. Compare the ZBB budget with the previous year's budget and highlight differences.
4. Discuss the advantages and disadvantages of ZBB compared to traditional budgeting methods.

Department	Previous Year ($)	ZBB Budget ($)
HR	500,000	450,000
Marketing	700,000	600,000
Operations	1,200,000	1,000,000