Email, First Name, and Last Name are not required fields in order for GoToWebinar to register a new user to an event. GoToWebinar is a web conferencing platform that allows you to host and join online meetings, webinars, and trainings. You can integrate Marketing Cloud Account Engagement with GoToWebinar using the GoToWebinar connector, which allows you to register prospects for GoToWebinar events from Marketing Cloud Account Engagement forms, landing pages, or completion actions. However, the only required field for GoToWebinar registration is Email. You can also include other fields, such as First Name, Last Name, Phone, or Company, but they are not mandatory. If you do not include these fields, Marketing Cloud Account Engagement will use the default values from the prospect’s record or the connector settings.

Answer A is incorrect because Email, First Name, and Last Name are not required fields in order for GoToWebinar to register a new user to an event, as explained above. References: [GoToWebinar Connector], [Set Up the GoToWebinar Connector]