A string is tied down at both ends. Some of the standing waves on this string have the following frequencies: 100 Hz, 200 Hz, 250 Hz, and 300 Hz. It is also known that there are no standing waves ________?
1) with frequencies less than 100 Hz
2) with frequencies between 100 Hz and 200 Hz
3) with frequencies between 200 Hz and 250 Hz
4) with frequencies greater than 300 Hz