What's the answer? I could not find the answer that question

Question

<form>
<input type="radio" id="r1">
<label for="r1">Cash</label>
<input type="radio" id="r2">
<label for="r2">Card</label>
</form>

What is missing here?

1.name attribute
2.value attribute
3.submit button

Multiple answer are used in here

Answer 1

go back to the lesson, there must be the answer, just look the code carefully