Two perfect 4-port circulators are cascaded, as shown in

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Two perfect 4-port circulators are cascaded, as shown in fig. to form a 6-port circulator.
Transmitter (T), receiver (R) antenna (A) and match load (L) are connected to these ports. Which one of the following interconnection schemes is correct?

1. T R A L
  4 5 6 1,2,3
2. T R A L
  3 5 6 1,2,4
3. T R A L
  2 3 4 1,5,6
4. T R A L
  1 3 2 ;4,5,6

Correct Option: A

NA