Consider the following schedule $S$ of transactions $T1$ and $T2:$
$${\begin{array}{l|l}
\textbf{T1}& \textbf{T2} \\\hline
\text{Read(A)} \\
\text{A = A – 10}\\
& \text{Read(A) }\\
& \text{Temp = 0.2*A} \\
& \text{Write(A)} \\
& \text{Read(B)} \\
\text{Write(A)}\\
\text{Read(B)}\\
\text{B = B + 10}\\
\text{Write(B)} \\
& \text{B = B + Temp} \\
& \text{Write(B)}\\
\end{array}}$$
Which of the following is TRUE about the schedule $S$ ?
- $S$ is serializable only as $T1, T2$
- $S$ is serializable only as $T2, T1$
- $S$ is serializable both as $T1, T2$ and $T2, T1$
- $S$ is not serializable either as $T1,T2$ or as $T2,T1$