Q26

Consider a complete graph $K_{n}$ with $n$ vertices ( $n>4$ ). Note that multiple spanning trees can be constructed over $K_{n}$. Each of these spanning trees is represented as a set of edges. The Jaccard coefficient between any two sets is defined as the ratio of the size of the intersection of the two sets to the size of the union of the two sets. Which one of the following options gives the lowest possible value for the Jaccard coefficient between any two spanning trees of $K_{n}$ ?