When the LOAD input of a buffer register is active, the input word is stored on the next positive _____ edge. A. clock B. pulse C. register D. transistor E. None of the above

The correct answer is: A. clock

A clock is a periodic signal that is used to synchronize the operations of a digital circuit. In a buffer register, the LOAD input is used to control when the input word is stored in the register. When the LOAD input is active, the input word is stored on the next positive edge of the clock signal.

The other options are incorrect because:

• A pulse is a single, brief change in the state of a signal. It is not used to synchronize the operations of a digital circuit.
• A register is a device that stores data. It is not used to synchronize the operations of a digital circuit.
• A transistor is a semiconductor device that is used to amplify or switch electronic signals. It is not used to synchronize the operations of a digital circuit.

I hope this helps!