Suppose the letters a, b, c, d, e, f have probabilities 1/2, 1/4, 1/8, 1/16, 1/32, 1/32 respectively. Which of the following is the Huffman code for the letter a, b, c, d, e, f?
0, 10, 110, 1110, 11110, 11111
11, 10, 011, 010, 001, 000
11, 10, 01, 001, 0001, 0000
110, 100, 010, 000, 001, 111
