With positive clocking the clock signal must be _____ for the flip-flop to respond. A. high B. low C. set D. race E. None of the above

The correct answer is A. high.

A flip-flop is a device that stores one bit of data. It has two stable states, which can be represented by 0 or 1. The state of the flip-flop is determined by the input signals and the clock signal.

With positive clocking, the clock signal must be high for the flip-flop to respond. When the clock signal is high, the input signals are sampled and the state of the flip-flop is updated.

When the clock signal is low, the flip-flop is in a hold state. The input signals are ignored and the state of the flip-flop is maintained.

Option B is incorrect because the

Option C is incorrect because the set state is a stable state of the flip-flop. The flip-flop will not change state if the input signals are in the set state.

Option D is incorrect because a race is a condition that can occur when two or more signals are changing at the same time. This can cause the flip-flop to change state unexpectedly.

Option E is incorrect because the clock signal must be high for the flip-flop to respond.