Final answer:
FINRA prohibits registered representatives from charging customers for certain activities or services.
Step-by-step explanation:
FINRA (Financial Industry Regulatory Authority) prohibits registered representatives of a firm from charging the customer for certain activities or services. These activities/services include:
- Opening or maintaining an account
- Processing orders
- Providing investment advice
- Handling transactions
Charging customers for these activities would be considered unethical and a violation of FINRA rules.