While executing DFS$,$ you pop a vertex $u$ from the Stack. We find that $u$ is not closed and $u$ has an edge to $x.$ Currently, level $[u]=5,$ level $[x]=$ infinity, $x$ is not closed, and $x$ is not on the stack. Answer:

At the end of this iteration, $u$

After the edge is relaxed, level $x$

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