Assertion (A): In rectangular waveguide TE01 mode is just TE10 mode rotated by 90°. Reason (R): When a rectangular waveguide is rotated by 90°, the broad and narrow dimensions get interchanged.

• Both A and R are correct and R is correct explanation of A
• Both A and R are correct but R is not correct explanation of A
• A is correct but R is wrong
• A is wrong but R is correct