Answer:
b) using the W3C Markup Validation Service to validate the HTML
Explanation:
A JavaScript is one of the mainly used programming language. It is famous all over the world. Every software uses a JavaScript which includes a productivity apps, server code, 3D games, IoT devices, robots, etc.
A JavaScript code mainly runs on a web browser. In order to provide a JavaScript in the HTML document, we code an HTML script element which contains a JavaScript. Using the W3C markup validation service in order to validate a HTML is not a testing phase of a JavaScript applications.