Final answer:
A principal must review the communication for an institutional customer's article request as mandated by FINRA Rule 2210, though filing with FINRA is not always required.
Step-by-step explanation:
According to FINRA Rule 2210 regarding communications with the public, when an institutional customer requests an article for their retail client newsletter, the correct process is to have a principal review the communication. While the rule mandates review by a principal, it does not necessarily require a filing with FINRA for this type of communication. However, it's important to note that specific circumstances, such as the content being related to certain types of investments or services, can dictate whether additional steps, like filing, are necessary. To confirm the exact requirements, it's advisable to review the most current version of the FINRA Rule 2210 or consult with a compliance officer.