Which of the following is firing temperature of hard porcelain?

• A. 1400 ¬¨¬®‚Äö√†√ªC
• B. 1300 ¬¨¬®‚Äö√†√ªC
• C. 1500 ¬¨¬®‚Äö√†√ªC
• D. 1200 ¬¨¬®‚Äö√†√ªC