The correct choice is (d) All of the mentioned
Easy explanation: Apache Log4j is a Java-based logging utility. It was originally written by Ceki Gülcü and is part of the Apache Logging Services project of the Apache Software Foundation. Since a major use of JavaScript logging is in browser testing, log4javascript is tested and works across all recent major browsers, including:
Internet Explorer 5+ for Windows
Mozilla, Firefox, Netscape
Google Chrome
Safari 1.3+
Opera 7.5+
WebKit
Konqueror 3.4+