Question: Consider the seven-node network (with nodes labeled t to z) in Problem P4. Show the minimal-cost tree rooted at z that includes (as end hosts)

Consider the seven-node network (with nodes labeled t to z) in Problem P4. Show the minimal-cost tree rooted at z that includes (as end hosts) nodes II, II, W, and y. Informally argue why your tree is a minimal-cost tree.

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