What is the minimum temperature given before hot forging?

• A. 100¬¨¬®‚Äö√†√ªC
• B. 150¬¨¬®‚Äö√†√ªC
• C. 200¬¨¬®‚Äö√†√ªC
• D. 250¬¨¬®‚Äö√†√ªC