Huawei's OLT family (SmartAX series) includes models like EA5800-X17, X7, X2, and others, totaling at least 4 variants, per HCSA-Sales-Transmission & Access, making A correct.
I remember learning about Huawei's OLT products in class, so I'm leaning towards option C for 3 models. But I'll double-check my notes just to be safe.
I'm just going to guess and say A. I mean, how many OLT models can one company really have? It's not like they're selling them by the dozen or something.
Nada
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