Question: Assume that two PIC18F4321s are interfaced in the SPI mode. A switch is connected to bit 0 of PORTD of the master PIC18F4321 and an LED is connected to bit 5 of PORTB of the slave PIC18F4321. Write C language programs to input the switch via the master, and output it to the LED of the slave PIC18F4321. If the switch is open, the LED will be turned ON while the LED will be turned OFF if the switch is closed.