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In which of the following cases, a parabolic reflector primary radiator is said to be ideal feed?

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In which of the following cases, a parabolic reflector primary radiator is said to be ideal feed?

(a) The entire reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

(b) Some part of reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

(c) Some part of reflector is illuminated with radiation in unwanted direction when feed radiated entire energy towards it

(d) The entire reflector is illuminated with small radiation in unwanted direction when feed radiated entire energy towards it

I got this question in unit test.

My query is from Feeding Systems topic in section Reflector Antenna of Antennas

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Right answer is (a) The entire reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

Explanation: A parabolic reflector primary radiator is said to be ideal feed, when the feed radiates entire energy, the reflector is fully illuminated and there is no energy radiation in unwanted direction.

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