(a²-b²) (x² - y²) + 4abxy এর উৎপাদক কত?

• ক (ax + by + ay - bx) (ax + by - ay + bx) ✅ সঠিক উত্তর
• খ (ax + by + ay + bx) (ax by - ay + bx)
• গ (ax by + ay bx) (ax + by - ay - bx)
• ঘ (ax by ay + bx) (ax by + ay - bx)