Question: We are using undo/redo logging to recover the database after a system crash. The log on the disk looks like the following: How to recover

We are using undo/redo logging to recover the database after a system crash. The log on the disk looks like the following: How to recover the database (do you redo, undo, or ignore T1,T2,T3, and T4 )? and what are the values of A,B,C, and D before and after the recovery (if the value is unsure, type "unknown")? Please fill the two tables below. We are using undo/redo logging to recover the database after a system crash. The log on the disk looks like the following: How to recover the database (do you redo, undo, or ignore T1,T2,T3, and T4 )? and what are the values of A,B,C, and D before and after the recovery (if the value is unsure, type "unknown")? Please fill the two tables below

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