========================================================
(hat tip gregnh) If a name is unmasked we know a lot of information, or lack thereof.
When a name is unmasked detailed records are made and kept.
Who requested the unmasking.
Must be an authorized person by written request.
Request must state a "reason."
Who did the actual unmasking.
The original collector of the name.
Name of the "intelligence agency," who agrees with the "reason!"
When each act occurred.
=====================================================
Ergo, if Rice is on-record as having signed the log to review secure documents, she can neither claim 5A or Exec-Privilege. (hat tip Cletus D. yokel)
Then, there is no reason for Rice to take the 5th when testifying.