Consider the below C# program.

static void Worker$1()\{$

Thread t$2=$ new Thread$($Worker$2)$;

t$2.$Start$()$;

Thread.Sleep$(1000)$;

Console.Write$("$b$")$;

$\}$

static void Worker$2()\{$

Console.Write$("$c$")$;

$\}$

static void Main$($string$[]$ args$)\{$

Thread t $=$ new Thread$($Worker$1)$;

Console.Write$("$a$")$;

t$.$Start$()$;

$\}$

Assume two changes to this code:

the last two statements in main are swapped

the Sleep statement is replaced with t$2.$Join$()$;

Which of the following are possible outputs of this program?

abc

acb

bac

bca

cab

cba