title: Routing process in mongodb which doesn't lets client to know they are interacting with server
body: <p>I got a mongodb question in my test which is as below:</p>
  <pre><code>Which Routing process in mongodb which doesn't lets client to know they are interacting with server:
  A. mongo.mongo
  B. mongoDB.mongoDB
  C. mongos.mongos
  D. mongos
  
  </code></pre>
  <p>I couldn't find the answer anywhere. Which of the above option is correct?</p>