Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）
- A A must contain all of the characters defined in B
- B A must be Unicode
- C The encoded values in A must match the encoded values in B for all characters defined in B
- D A must be a multibyte character set
- E The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B