SCHEMA:
CREATE TABLE table_name_91 (calendar VARCHAR, image_attachment VARCHAR, wysiwyg_editor VARCHAR, unread_message_tracking VARCHAR)
USER:
Which Calendar has a WYSIWYG Editor of no, and an Unread message tracking of session, and an Image attachment of no?

QUERY:
SELECT calendar FROM table_name_91 WHERE wysiwyg_editor = "no" AND unread_message_tracking = "session" AND image_attachment = "no"