A graph has 20 vertices. The maximum number of edges it can have is? (Given it is bipartite)

A graph has 20 vertices. The maximum number of edges it can have is? (

1.	A graph has 20 vertices. The maximum number of edges it can have is? (Given it is bipartite)
A.	100
B.	140
C.	80
D.	20
Answer» B. 140