What are two reasons that video conferencing solutions developed before the 1990s were impractical?

What are two reasons that video conferencing solutions developed before the 1990s were impractical? (Choose two)
A. They operated at a high expense.
B. They produced an unreliable image quality
C. They produced high-resolution image quality
D. They had not been invented yet.
E. They operated at a high frame rate

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