For the anonymous block below, what is the correct reference to the father's date of birth in the inner block?

$<<$ outer$>>$

DECLARE

v$\_$father$\_$name VARCHAR$2(20)$:$=$'Patrick';

v$\_$date$\_$of$\_$birth DATE:$=\text{'}20-$Apr$-1972\text{'}$;

BEGIN

DECLARE

v$\_$child$\_$name VARCHAR$2(20)$:$=$'Mike';

v$\_$date$\_$of$\_$birth DATE:$=\text{'}12-$Dec$-2002\text{'}$;

$...$

$<<$ outer.v$\_$date$\_$of$\_$birth $>>$

v$\_$date$\_$of$\_$birth.outer

outer.v$\_$date$\_$of$\_$birth

$<<$ outer$>>$v$\_$date$\_$of$\_$birth