The irises in the rectangular metallic waveguide may be 1)

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The irises in the rectangular metallic waveguide may be
1) inductive
2) resistive
3) capacitive
Select the correct answer using the code given below.

[ESE 2019 Paper 2 (Technical) ECE]

A 1, 2 and 3

B 1 and 2 only

C 1 and 3 only

D 2 and 3 only