Which regional biryani style, from a former princely state, is famously cooked using the "dum" method of sealing the pot to slow-cook rice and meat together?

• A Hyderabadi biryani ✓
• B Lucknowi biryani
• C Kolkata biryani
• D Sindhi biryani

Hyderabadi biryani's dum style, sealing the pot with dough to trap steam, is one of India's most famous biryani traditions.