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Which of the following coincides with the focus of the parabolic reflector in a Cassegrain antenna?

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Which of the following coincides with the focus of the parabolic reflector in a Cassegrain antenna?

(a) Feed

(b) Parabolic reflector

(c) Focus of hyperboloid reflector

(d) Focus of primary radiator

The question was posed to me in semester exam.

I'd like to ask this question from Feeding Systems in chapter Reflector Antenna of Antennas

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Right choice is (c) Focus of hyperboloid reflector

The explanation: The focus of the sub-reflector coincides with the focus of parabolic reflector and it illuminates the reflector. Since it is a Cassegrain, the sub-reflector is a hyperboloid reflector.

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