Of course
(1) Is this your signature?
(2) Did you sign this at the direction of someone, or on your own accord?
If she answers those two by pleading the fifth, turn her over to a grand jury. (hat tip hoosiermama)
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(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.
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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)