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
- $TE_{01}<TE_{10}<TE_{11}<TE_{20}$
- $TE_{20}<TE_{11}<TE_{10}<TE_{01}$
- $TE_{10}<TE_{20}<TE_{01}<TE_{11}$
- $TE_{10}<TE_{11}<TE_{20}<TE_{01}$