(a) Form element labeled as 1 is a Textbox and Form element labeled as 2 is a Textarea.(b)Text areas are the fields that display multiple text lines at a time hence it has been used to accept Address which also contains multiple lines of text.(c) <input type='radio' name='Ltype' value='DND'>Do Not Disturb <input type='radio' name='Ltype' value='Vib'>VIBRATE <input type='radio' name='Ltype' value='Act'>Active (d) Form element labeled as 3 is a Radio button .It enables the selection of one of the options out of the many.Whereas, Form element labeled as 4 is a Checkbox. As compared to radio button, acheckbox allows for multiple selections of items.To highlight one item in a dropdown box ,“selected” clause is used in the<Option selected>Eg:<select><option>SINGAPORE</potion><option selected>JAPAN </option><option selected>MALAYSIA</option></select>