In a two stage cascade amplifier the equivalent noise temperatures are Te1 and Te2. If the gains of the two stages are G1 and G2, the overall noise temperature Te is

• A. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/505-231-1.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/505-231-2.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/505-231-3.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/505-231-4.png">