সাবমেরিন ক্যাবল প্রযক্তিতে নিচের কোন ধরনের মাধ্যমে ব্যবহৃত হয়?
A. VAST
B. শব্দ তরঙ্গ
C. চুম্বক তরঙ্গ
D. অপটিক্যাল ফাইবার
সঠিক উত্তরঃ
D.
অপটিক্যাল ফাইবার
Explanation:
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