78. Sleep Modes Power Management

Which of the following options is true when the button is pressed and released instantly? (After executing the following code on an Arduino UNO)

Code

#include <avr/power.h>
#define SWITCH_PIN 2
#define LED_PIN 13  //onboard LED

void switchPressHandler(){
  clock_prescale_set(clock_div_16);
}

void setup() {
  pinMode(13, OUTPUT);
  pinMode(SWITCH_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(SWITCH_PIN), switchPressHandler, FALLING);
}

void loop() {
  digitalWrite(LED_PIN,HIGH);
  delay(100);
  digitalWrite(LED_PIN,LOW);
  delay(100);
}