Under which of the following circumstances, if any, is it permissible for an individual without...

Step by Step Explanation:

Prohibition on Signing Customer Names: It is never permissible to sign a customer's name without written authorization (POA) due to legal and ethical concerns. Unauthorized signing constitutes forgery and violates FINRA rules.

Incorrect Options:

A: Firm principal approval does not override this prohibition.

B: Verbal authorization is insufficient.

C: Discretionary authority does not allow unauthorized signing.

References:

FINRA Rule 4512 (Customer Account Information): FINRA Rule 4512.