The shadow-paging scheme requires the page table to be copied. Suppose thepage table is represented as a B+-tree.a. Suggest how to share as many nodes as possible between the new copyand the shadow copy of the B+-tree, assuming that updates are madeonly to leaf entries, with no insertions or deletions.b. Even with the above optimization, logging is much cheaper than ashadow copy scheme, for transactions that perform small updates. Explainwhy.

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