Which one is TRUE for RFID?

Which one is TRUE for RFID? Correct Answer Uses electromagnetic signal

Radio Frequency Identification (RFID), Data transfer করার জন্য তড়িৎ চুম্বকীয় Signal ব্যবহার করে।
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Department ores range form two to nine floors in height. If a store has more than three floors , it has a lift. If he statements above are true, which of the following must also be true?