Correct choice is (b) <summary>
Best explanation: <dialog> element in HTML represents a dialog box or other interactive component like window or an inspector. <summary> element is known as Disclosure Summary element. It specifies caption, summary or legend for <details> element’s disclosure box. This element only includes global attribute. This element may only be used as the first child of <details> element. <menuitem> represents a command which helps user to pop up through menu. <menu> is a group of commands which is used to perform something.