Guide wavelength ( g), cutoff wavelength ( c) and free space wavelength ( 0) of a waveguide are related as

• A. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/16-166-1.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/16-166-2.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/16-166-3.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/16-166-4.png">