The modes in a rectangular waveguide are denoted by TEmn / TMmn, where m and n are the Eigen values along the larger and smaller dimensions of the waveguide respectively. Which one of the following statements is true?

• A. The TM10 mode does not exist
• B. The TE10 mode does not exist
• C. The TE10 and TM10 both exist and have same cut off frequencies
• D. When m and n are increases, the cut off frequency decreases