Which JavaScript statement should you place in the blank if you want to create an event handler that opens a dialog box to alert the user to a change in the data saved to web storage? $\{$window$.$alert$("$Value of $"+$ e$.$key $+$ "changed from"$+$e$.$oldValue $+"$to$"+$ e$.$newValue$+"."\}$;

a$.$ window.onclick.getItem $=$ function$($e$)$b$.$ localStorage.onstorage $=$ function$($e$)$

c$.$ window.onstorage $=$ function$($localStorage$)$d$.$ window. onstorage $=$ function$($e$)$