Final answer:
In Bluebeam Revu, the markup tools that are only temporarily stored for the duration of the current Revu session are called c) Session Markup.
Step-by-step explanation:
The markup tools that are temporarily stored only for the current Revu session are known as option c:Session Markup.
In the context of Bluebeam Revu, a popular PDF editing and markup software, this feature allows users to add annotations or markups that can be viewed and potentially edited by other participants during a shared Revu session. At the end of the session, these markups are not automatically saved with the document; they are considered transient and solely exist within that particular session. For markups to become a permanent part of the PDF file, they would need to be specifically saved or otherwise noted as part of the document's enduring changes beyond the immediate session.