Given the code of two processes that share the variable $b$ whose initial

value is $2,$

Process A:

$c=b-1$;

$b=2**c$

Process B:

$d=2**b$;

$b=d-1$;

one possible value of $b$ at the end of execution could be

Select one:

a$.6$

b$.7$

C$.4$

d$.5$