Consider the following database schedule with two transactions,

Consider the following database schedule with two transactions, T₁ and T₂.
S = r₂ (X); r₁(X); r₂ (Y); w₁ (X); r₁ (Y); w₂ (X); a₁; a₂
where r_i (Z) denotes a read operation by transaction T_i on a variable Z, w_i (Z) denotes a write operation by T_i on a variable Z and a_i denotes an abort by transaction T_i.
Which one of the following statements about the above schedule is TRUE ?

1. S is non-recoverable
2. S is recoverable, but has a cascading abort
3. S does not have a cascading abort
4. S is strict

There is no transaction which reads the data item written by any other transaction. Therefore the given schedule is cascadeless.