'Bluetooth' নিচের কোন প্রযুক্তি ব্যবহার করে?
A. ম্যাগনেটিক
B. অপটিক্যাল
C. লেজার
D. রেডিও ফ্রিকোয়েন্সি
সঠিক উত্তরঃ
D.
রেডিও ফ্রিকোয়েন্সি
Explanation:
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