Consider a postings intersection between this postings list, with skip pointers:$359152439606875818489929697100115$and the following intermediate result postings list $($which hence has no skip pointers$)$:$3589959799100101$Trace through the postings intersection algorithm in Figure $2\mathrm{.}10($page $37).$a$.$ How often is a skip pointer followed $($i$.$e$.,$ p$$ is advanced to skip$($p$1))?$b$.$ How many postings comparisons will be made by this algorithm while intersect$-$ ing the two lists?c$.$ How many postings comparisons would be made if the postings lists are inter$-$ sected without the use of skip pointers?