DCI is critical for industries with high data transfer needs, per HCSA-Sales-Transmission & Access:

Finance (A): Requires low-latency, secure interconnects.

Large Enterprise (D): Needs scalable data center links.

ISP (E): Manages massive traffic between data centers.

Government (B) and Education (C): Less focus on DCI; more on campus or access networks.

Thus, A, D, and E are correct.