a , b , and c are the three ( k = 3 ) nearest neighbors for p . What is the LOF for point p ? Here r X represents the average reachability distance for a neighbor x ( x is either a , b , or c ) . d 3 ( p ) is the average reachability distance of p among all k nearest neighbors. a. 1/2 b. 13/3 C. 1/4 d. None of others.