$1($a$)$ Consider the following program, assuming that A and B are variables in memory

initialized to $0,$ and R$1,$ R$2,$ and R$3$ are registers:

P$1$ P$2$ P$3$

A$=1$ R$1=$A R$2=$B

B$=1$ R$3=$A

Executions of this program can be characterized by the values returned by the loads at

the end of its execution, i$.$e$.,$ by the values of R$1,$ R$2,$ and R$3$ at the end of execution.

Using these register values, list the executions $($if any$)$ that are

$($a$1)$ not coherent;

$($a$2)$ not sequentially consistent;

$($a$3)$ not TSO;