Meeta correctly remembers that her father's birthday is after 8th July but before 12th July. Her brother correctly remembers that their father's birthday is after 10th July but before 15th July. On which day of July was definitely their father's brithday?

• A. 10th
• B. 11th
• C. 10th or 11th
• D. Can't be determined
• E. None of these