Please solve these question as soon as possible . Please give it to me quickly .

This question is from the Algorithm course of Computer Science & Engineering subject.

I promise I will upvote.

1. Explain the following questions with suitable examples. [CO1, C2, a. Shortest path can have negative cycle as it reduces cost but no positive cycle Marks: - do you agree? Why or why not? 2+2] b. Does it possible total outgoing flow of source node and total incoming flow of sink node is not equal of a network in any case? Explain