The answer is a) It improves upon the two-phased commit by requiring that locks be acquired at the start of a transaction.
Reason: The 3PC is an extension or you can say developed from 2PC that avoids blocking of an operation. It just ensures that first n sites have intended to commit a transaction that means it acquires commits or locks before the start of any transaction to avoid any blocking.
Option b) is wrong as it does not allow coordination, it just let all the other sites do their transaction if any other site is blocked, so no coordination is there between sites that they will wait till their coordinator is corrected.
Option c) is wrong as lock operations are shared between other connections as when their coordinator fails, the new coordinator agrees to the old coordinator that they had shared locks before and they can start their transaction.
Option d) is wrong as option a) is correct.
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The correct answer is B. locate Web pages related to a specific subject.
An example of a search engine is Google: it helps you find Websites with the content you're looking for.
D. mouse that is your answer <span />
The right answer for the question that is being asked and shown above is that: "Currently dispatched threads." The part of the software hierarchy is working behind the scenes allowing programs to perform tasks is that <span>Currently dispatched threads</span>
