If a Pull-Down Menu's ≪code>select</code> Element Has a ≪code>required</code> Attribute

Multiple Choice

If a pull-down menu's <code>select</code> element has a <code>required</code> attribute, it means that when the pull-down menu's form is submitted:

A) the pull-down menu expands to show all the menu's options.
B) the browser highlights the pull-down menu, usually with a red border.
C) the pull-down menu control is considered to be invalid if the user's selected value is the empty string.