check only one radio button html code example

Example 1: html radio only one checked

<!--Just manke both names equal -->
<input type="radio" name="options" id="1"/>
<input type="radio" name="options" id="2"/>

Example 2: selecting only one radio button

<!-- Just give all the radio buttons the same name. 
Html will then allow you to select only one. -->

<input type="radio" name="radAnswer" />