প্রশ্নঃ ISD এর পূর্ণরূপ কি ?
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ক.International Standard Dialing
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খ.Internet Standard Dialing
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গ.International System Dialing
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ঘ.Internet System Dialing
উত্তরঃ গ
 International Standard Dialing খ) Internet Standard Dialing গ) International System Dialing ঘ) Internet System Dialing উত্তর: গ) International System Dialing
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