Given,

num$\_$pages $=\{"$book$1"$: $255,$ "book$2"$: $312,$ "book$3"$: $456\}$

How to add an element with key "book$4"$ and value $532$ to the dictionary num$\_$pages?

Group of answer choices

num$\_$pages.append$("$book$4",532)$

num$\_$pages$["$book$4"]=532$

"book$4".$append$(532)$

num$\_$pages$[$book$4]=532$