In a microwave coaxial line, the maximum operating frequency is f max and breakdown strength of dielectric is Ed' Then maximum power handling capacity is proportional to

• A. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/18-214-1.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/18-214-2.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/18-214-3.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/microwave-communication/18-214-4.png">