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Consider an air-filled rectangular waveguide with dimensions $a=2.286\:cm$ and $b=1.016\:cm$. The increasing order of the cut-off frequencies for different modes is

1. $TE_{01}<TE_{10}<TE_{11}<TE_{20}$
2. $TE_{20}<TE_{11}<TE_{10}<TE_{01}$
3. $TE_{10}<TE_{20}<TE_{01}<TE_{11}$
4. $TE_{10}<TE_{11}<TE_{20}<TE_{01}$