7. Show the result of the following sequence of instruction: union(1,2), union(3,4), union(3,5), union (1,6), union(3,7), union(8,9), union(1,8), union(3,10), union(3,11), union(3,12), union(3,13), union(14,15), union(16,0), union(14,16), union(1,3), union(1,14) where the union are [15 Points] a. Performed arbitrarily b. Performed by height c. Performed by size