What Will Be The Output Of The Following Javascript Codep Pre #328

What will be the output of the following JavaScript code?</p> <pre><code class="language-javascript"> <p id="demo"></p> <script> var arr = ["1", "1", "2", "1"]; var a = arr.lastIndexOf("1"); document.getElementById("demo").innerHTML = (a + 1); </script> </code></pre>

This multiple choice question (MCQ) is related to the book/course gs gs106 Javascript. It can also be found in gs gs106 Server-Side and Client-Side JavaScript - Embedding JavaScript in HTML - Quiz No.2.

 <p id="demo"></p> <script> var arr = ["1", "1", "2", "1"]; var a = arr.lastIndexOf("1"); document.getElementById("demo").innerHTML = (a + 1); </script>