Final answer:
The 3 categories of FINRA defined Communications are written, oral, and electronic.
Step-by-step explanation:
The 3 categories of FINRA defined Communications are:
Written: This category includes any communication that is in written form, such as letters, emails, or brochures.
Oral: This category includes any communication that is spoken, such as phone conversations or face-to-face meetings.
Electronic: This category includes any communication that is transmitted electronically, such as text messages, social media posts, or website content.