Three scores, Pnum (i), Hnum (i,j), and Ssum, have been derived to assist with a determination of the reliability of a secondary structure prediction for a particular base i or a base pair i,j. Which of the following is not a correct regarding Ssum?

• A. is also called as ss-count
• B. is the number of foldings in which base i is single-stranded divided by m, the number of folding
• C. is the number of foldings in which base i is single-stranded multiplied by m, the number of folding
• D. gives the probability that base i is single-stranded