单选题：To describe the expression $$(x+y)*((x+y)/x)$$ using a directed

To describe the expression $$(x+y)*((x+y)/x)$$ using a directed acyclic graph, the least number of vertices needed is: @[A](2)

A. 5
B. 6
C. 8
D. 9




A.5
B.6
C.8
D.9


答案：A