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 character