title: Which interface does AddRange() belong to in List<T>?
body: <p><code>List&lt;T&gt;</code> implements the following interfaces:</p>
  <pre><code>IList&lt;T&gt;
  ICollection&lt;T&gt;
  IList
  ICollection
  IReadOnlyList&lt;T&gt;
  IReadOnlyCollection&lt;T&gt;
  IEnumerable&lt;T&gt;
  IEnumerable
  </code></pre>
  <p>None of them has <code>AddRange()</code>.</p>
  <p>Which interface does <code>AddRange()</code> belong to in <code>List&lt;T&gt;</code>?</p>