How can you center an image (in relation to parent

How can you center an image (in relation to parent block) ?

If the conditions are:

div#parent - the parent block;
img - an image which has to be centered.
Choose correct statements for realization.

Explanation

Click here!


<table width="100%" height="100" border="1"> 
 <tr>
  <td align="center" valign="center">
   <a href="https://codegalaxy.io/">
    <img src="https://codegalaxy.io/app/assets/images/quizful-small.png"
    alt="qizful-small.png" width="25%" height="15%" border="1">
    Click here!
   </a>
  </td>
 </tr>
</table>