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Which of the following schedules is non - recoverable? a . Sch 2 : r 1 ( X ) ; w 1 ( X )

Which of the following schedules is non-recoverable?
a.
Sch2: r 1(X); w 1(X); r 1(Y); r 2(X); w 1(Y); w 2(X); C 1 ; C 2 ;
b.
Sch4: r 1(X); w 1(X); r 1(Y); r 2(X); w 2(X); w 1(Y); C 1 ; C 2 ;
c.
Sch3: : r 1(X); w 1(X); r 1(Y); r 2(X); w 1(Y); w 2(X); C 2 ; C 1 ;
d.
Sch1: r 1(X); w 1(X); r 1(Y); r 2(X); w 1(Y); C 1 ; w 2(X); C 2 ;

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