QUESTION 1: [6 POINTS] Assume you have the following schedule. Transaction T1 Transaction T2 Transaction T3 read_item (Y); read_item (Z); read item (X); Write_item (X); A. Draw serializability graph. [4 POINTS] . State whether it is serializable or not, and why. [1 POINT] c. If the schedule is serializable, write down the equivalent serial schedule. [1 Point]