Under FINRA rules, which of the following activities is not considered an outside business activity...

Step by Step Explanation:

Outside Business Activity Definition: Per FINRA Rule 3270, an OBA involves compensated business activities outside the scope of the RR’s role at their firm. Passive investments are excluded because they do not require active involvement.

Incorrect Options:

A, B, and C: Selling real estate, selling insurance, and refereeing are considered OBAs as they involve active participation and compensation.

References:

FINRA Rule 3270 (Outside Business Activities): FINRA Rule 3270.