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What is the difference between a ring shift counter and a Johnson shift counter?

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What is the difference between a ring shift counter and a Johnson shift counter?

(a) There is no difference

(b) A ring is faster

(c) The feedback is reversed

(d) The Johnson is faster

I got this question in semester exam.

The doubt is from Universal Shift Registers in section Registers of Digital Circuits

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Correct choice is (c) The feedback is reversed

Best explanation: A ring counter is a shift register (a cascade connection of flip-flops) with the output of the last one connected to the input of the first, that is, in a ring. Whereas, a Johnson counter (or switchtail ring counter, twisted-ring counter, walking-ring counter, or Moebius counter) is a modified ring counter, where the output from the last stage is inverted and fed back as input to the first stage.

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