单选题：The minimum spanning tree of any connected weighted graph \_\_\_

The minimum spanning tree of any connected weighted graph \_\_\_\_
@[B](3)

A. must be unique
B. must have a unique minimum weight
C. must not be unique
D. may not exist



A.must be unique
B.must have a unique minimum weight
C.must not be unique
D.may not exist


答案：B