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 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!