Which of the following scenarios may lead to an...

Which of the following scenarios may lead to an irrecoverable error in a database system ?
 

(A) A transaction writes a data item after it is read by an uncommitted transaction

(B) A transaction reads a data item after it is read by an uncommitted transaction

(C) A transaction reads a data item after it is written by a committed transaction

(D) A transaction reads a data item after it is written by an uncommitted transaction

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