You're likely correct.

Multiple ServiceNow KB articles confirm "Meeting Invitation" exists as a notification type (not method)

KB0821377: Meeting Invitation notification shows plain text instead of formatted HTML email
KB0755834: Email Notifications of Type Meeting Invitation Don't Send Images
KB0728505: The email Notification with an Outlook Meeting Invite not passing Description field

ServiceNow documentation states: ServiceNow supports standard Email, SMS, and Push notifications

Correct notification methods: Email, SMS, Browser Pop-ups/Push
Your answer (B, C, E) appears accurate.