Consider the following statements about directional coupler shown in the figure Ports 1 and 2 are decouple Ports 3 and 4 are decoupled Pots 1 and 3 are decoupled Ports 1 and 4 are decoupled Which of the above statements are correct?

• 1 and 2 only
• 3 and 4 only
• 1, 2 and 3
• 2, 3 and 4