Question from the Vue.js test

If one wants to create a routing system using the vue-router package, in the code below, what should <!-- ????????? --> be replaced with to make the application's routing work?

<script src="https://unpkg.com/vue@3"></script>
<script src="https://unpkg.com/vue-router@4"></script>

<div id="app">
  <h1>Hello WeLoveDevs!</h1>
  <p>
     <router-link to="/">Home of devs</router-link>
     <router-link to="/about">Who are we?</router-link>
  </p>
 
 <!-- ????????? -->
 
</div>