The registrar is responsible for your transcript, academic counselors offer guidance on courses, and supervisors in undergraduate research are principal investigators.
The person responsible for your transcript is the registrar. The registrar in educational institutions is in charge of maintaining and updating student records, including transcripts.
Students usually interact with their academic counselor for guidance on course selection and degree requirements.
If you're an undergraduate, your supervisor in research would be considered the principal investigator for your study.
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