Which of the following describes a flip-flop feedback loop?

A flip-flop feedback loop typically features a mechanism where two elements inhibit each other, creating a toggling effect between them. In this context, describing it as "A stops B and B stops A" accurately reflects this reciprocal inhibition. This interplay allows the system to alternate states, which is a characteristic of a flip-flop mechanism. This feedback can lead to stable states, where one element is active while the other is inactive, or it can shift between states based on the conditions present.

The other options present different kinds of regulatory relationships; for example, enhancing feedback loops would not create the toggling behavior characteristic of flip-flops. Thus, the defining nature of the flip-flop feedback loop is adequately captured in the description where each element inhibits the other.