void $*$mythread$($void $*$arg$)\{$

printf$("\%$s

$",($char $*)$ arg$)$;

return Null;

$\}$

int

main$($int argc, char $*$argv$[])\{$

pthread$\_$t p$1,$ p$2$;

int rc;

printf$("$main: begin

$")$;

Pthread$\_$create$($&p$1,$ NULL, mythread, $"$A$")$;

Pthread$\_$create$($&p$2,$ NULL, mythread, $"$B$")$;

Pthread$\_$join$($p$1,$ NULL$)$;

Pthread$\_$join$($p$2,$ NULL$)$;

printf$("$main: end

$")$;

return $0$;

$\}$

Above C program starts off two worker threads P$1$ and P$2$ to print out a letter $"$A$"$ and $"$B$"$ respectively. If the two lines highlighted in RED are removed, what is likely to happen compared with the output of existing program?

thread p$1$ and p$2$ will not be started

Letter $"$A$"$ or $"$B$"$ will be printed in indeterministic order

Both $"$A$"$ and $"$B$"$ are printed, or either $"$A$"$ or $"$B$"$ is printed, or neither is printed.

"main: end" will not$$be$$printed$$out