The logic for the answer remains the same but applied to all three locations.

1. HTTP Method: To create a new resource (a meeting, in this case), the standard and required HTTP method is POST. The http.request function in Node.js takes an options object to specify this.
2. Authentication Tag: The Webex XML API uses a <securityContext> element for authentication. The correct XML tag for a temporary authentication token is <sessionTicket>.
3. XML Syntax: Basic XML syntax requires that every opening tag (e.g., <sessionTicket>) has a corresponding closing tag (</sessionTicket>). Therefore, the same sessionTicket string must be used for both the opening and closing tags.

Cisco Webex Meetings XML API Reference Guide: This official vendor documentation specifies the required elements for API requests.

HTTP Method: The "XML API Basics" > "Sending a Request" section states that all XML API requests must be sent as an HTTP POST request.

Authentication: The "Security" > "Security Elements in Header" section details the element and explicitly lists as the element for the session ticket. (Direct URL: Webex XML API Documentation)