What are the system inputs for the digital alarm clock a digital alarm clock that has seven segment digits for the display, a piezo buzzer for the alarm, and push buttons to set the clock and the alarm and to turn on and off the alarm. It has a separate clock module that is crystal controlled that can supply the time information to the processor module.

The data from the real$-$time clock module

The push buttons

The alarm on and off switch

All the above