selecting specfic option from a drop down menu using js

Question

HTML code :

<select id = "menu">
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
</select>

What I have tried :

document.getElementById("menu").selectedIndex = 2015; 

Answer 1

document.getElementById("menu").value =  2015;