The figure shows a simple detector circuit for amplitude modulated wave v(t) = (1 + m cos mt) cost ct. If the detector is to follow the envelope of modulated wave at all times the extent of modulation m must be less than or equal to m0 where m0 is given by equation

• A. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/514-431-2.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/514-431-3.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/514-431-4.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/514-431-5.png">