A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by

A)
a shunt capacitance at the discontinuity
B)
a shunt resistance at the discontinuity
C)
a shunt inductance at the discontinuity
D)
None of the above

Correct Answer : Option (A) :   a shunt capacitance at the discontinuity