Final Answer:
To withdraw from the course during drop/add, you would need to send an official email to 1) Registrar.
Step-by-step explanation:
The Registrar is typically responsible for managing student records, including course registrations and withdrawals. In the context of dropping or adding a course, the Registrar's office is the appropriate channel for communication. Sending an official email to the Registrar notifies them of your intent to withdraw, ensuring that the proper procedures are followed, and your academic records are updated accordingly.
While advisors, deans, and instructors may provide guidance, the official process for course withdrawal, especially during drop/add, involves communication with the Registrar to ensure accurate and official documentation of the student's enrollment status.
Option A is the answer.