Let's say you have the following variable assignment:

$nu{m}_{i}nt=123$

which of the following will not generate a runtime error? $($more than one may be true.$)$

print$("$num$\_$int $=$ "num$\_$int$)$

print$("$num$\_$int $=+$ num$\_$int$)$

print$("$num$\_$int $="+$ str$($num$\_$int$))$

print$($num$\_$int $=+$ "num$\_$int"$)$