Which of the following is included in the operational mechanism of the index locking protocol?

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answerhappygod
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Which of the following is included in the operational mechanism of the index locking protocol?

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a) Every transaction must have at least one index
b) A transaction that performs a lookup must acquire a shared lock on all the index leaf nodes that it accesses
c) The rule of the two phase locking mechanism must be observed
d) All of the mentioned
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