An online conference takes place on the web. it's an interactive website, wherever participants go online and browse papers, enter discussions with different delegates and presenters, have live chat, and are able to pose questions and act with people from everywhere in the world. Some popular software (apps) used for conducting online conferences are:ZoomSkypeSlackBig Blue ButtonBlue JeansMicrosoft TeamsGoToMeetingGoogle MeetBlackboard CollaborateHence, the correct answer is A, B, and D only. Additional InformationKOHA: Koha is an open-source integrated library system, used worldwide by the public, school, and special libraries. Moodle: Moodle is a free and open-source learning management system written in PHP and distributed under the GNU General Public License.