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 <lightning:radioGroup 
  variant="label-hidden" 
  value="{!v.ET3}" 
  class="slds-p-left_medium slds-p-top_medium" 
  label="Radio Group Label" 
  options="{!v.options}"
   required="true" 
  type="radio">
</lightning:radioGroup>
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  • When you add 'required="true"`, it displays a red asterisk as a visual indicator specifies that an input field must be filled out before submitting the form.
    – Saroj Bera
    2 days ago

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