Question 1. Which of the following schedule and sequence of locks are possible under tw (Note: sl, xl, ul stand for shared lock, xlock and unlock of a data item. Assume that xl work upgrade lock.)? ) sl1(x) sl2(x) sl2(y) r1(x) r2(x) r2(y) ul2(y) ul2(x) xl1(x) xl1(y) w1(x) w1(y) xl2(z) w2(z) ) sl2(x) sl2(y) sl1(x) r1(x) r2(x) r2(y) ul2(x) ul2(y) xl1(x) w1(x) w1(y) xl1(y) xl2(z) w2(z) ) sl2(x) sl2(y) sl1(x) r1(x) r2(x) r2(y) ul2(x) ul2(y) xl1(x) xl2(z) w1(x) w1(y) xl1(y) w2(z) ) sl2(x) sl2(y) sl1(x) r1(x) r2(x) r2(y) xl2(z) ul2(x) ul2(y) w1(x) w1(y) xl1(y) w2(z) ) sl1(x) sl2(x) r1(x) r2(x) sl2(y) r2(y) xl2(z) ul2(y) ul2(x) xl1(x) xl1(y) w1(x) w1(y) w2(z) ) xl1(x) sl2(x) r1(x) r2(x) sl2(y) r2(y) xl2(z) ul2(y) xl1(y) w1(x) w1(y) w2(z) None of these options

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