title: Which of the following statements are true about MongoDB replication?
body: <ol>
  <li>The minimum sensible number of voting nodes to a replica set is three.</li>
  <li>MongoDB replication is synchronous. </li>
  <li>The Mongo shell is capable of attaching to a replica set and automatically failing over.</li>
  <li>By default, using the new MongoClient connection class, w=1 and j=1.</li>
  <li>The oplog utilizes a capped collection.</li>
  </ol>
  
  <p>I have selected 1,3,5 in answers but still get wrong answers.
  can anyone help me which one is right options for replication?</p>