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The circuits of NOR based S-R latch classified as asynchronous sequential circuits, why?

(a) Because of inverted outputs

(b) Because of triggering functionality

(c) Because of cross-coupled connection

(d) Because of inverted outputs & triggering functionality

I got this question in final exam.

My question is from Flip Flops in portion Flip-Flops of Digital Circuits

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The correct answer is (c) Because of cross-coupled connection

For explanation I would say: The cross-coupled connections from the output of one gate to the input of the other gate constitute a feedback path. For this reason, the circuits of NOR based S-R latch classified as asynchronous sequential circuits. Moreover, they are referred to as asynchronous because they function in the absence of a clock pulse.

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