Final answer:
The Enrollment Application can be signed by (A) the consumer themselves or by the consumer's authorized legal representative, such as one with a Power of Attorney, because Enrollment Applications usually involve agreeing to legally binding terms.
Step-by-step explanation:
The person who has the authority to sign an Enrollment Application is typically the consumer or the consumer's authorized legal representative, such as someone with a Power of Attorney. That is because Enrollment Applications often involve the agreement to terms of service or legal contracts, which require an individual who has the authority to make such decisions on behalf of the consumer. In the context of children or those who cannot legally give consent, a parent or legal guardian can provide consent on their behalf.
In the options presented, it seems that the most appropriate and legally sound option would be either the consumer themselves or the consumer's authorized legal rep (e.g., Power of Attorney), which provides a clear sense of legal authority in signing such important documents.