(20) 1. Consider the following matrix that corresponds to a relation R on {cat, dog, horse, monkey). cd hm cro o o 17 di 100 no non mi 0 0 0 b. Find the symmetric closure of R. (Give answer in the form of a matrix.) a. Find the reflexive closure of R. (Give answer in the form of a digraph.) cat dog horise) Imonkey c. Find the transitive closure of R. (Give answer in the form of a matrix and a directed graph.) 2