Answer: B
S2: If the Huffman code of some character is ' 0 ' or ' 1 ' then this character's frequency in the code is at least $50 \%$.
False.
Example 1: 'a' has freq. $1 / 100$, 'b' has freq. $99 / 100$, an optimal coding is 'a' gets '0' and ' $b$ ' gets ' 1 '.
Example 2; 'a' 'b' and 'c' each has freq. 1/3. an optimal coding: 'a'-'0', 'b'-'10', c-' 11 '.
