Consider the network graph shown in the figure which one of the following is NOT a 'tree' of graph

• A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-2.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-3.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-4.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-5.png">