Final answer:
Behavioral Skills Training is the method used by a BCBA supervisor during supervision.
Step-by-step explanation:
The teaching and feedback method that a BCBA supervisor is most likely to utilize during supervision is Behavioral Skills Training. This method involves breaking down complex behaviors into smaller, teachable components and then using a combination of instructions, modeling, rehearsal, and feedback to teach those components. It is commonly used in ABA to train individuals to learn new skills and behaviors.