question: What are some bands that Wi-Fi can operate over ?
answer: 900 MHz , 2.4 GHz , 4.9 , 5.2 , 5.4 , 5.7 , and 5.8 GHz bands
turker_answer: Some of the bands that Wi-Fi can operate over are 900 MHz , 2.4 GHz , 4.9 , 5.2 , 5.4 , 5.7 , and 5.8 GHz .
rule-based: Some bands that Wi-Fi can operate over are 900 MHz , 2.4 GHz , 4.9 , 5.2 , 5.4 , 5.7 , and 5.8 GHz bands .