1. ESP32 GPIO Programming

Bob is a space cat who found the following circuit &code, He has to turn ON LED,  which buttons do he need to press?

int button1 = 17;
int button2 = 16;
int button3 = 4;
int ledPin = 2;


void setup() {
  pinMode(button1, INPUT_PULLDOWN);
  pinMode(button2, INPUT_PULLUP);
  pinMode(button3, INPUT);


  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
}


void loop() {
  int state1 = digitalRead(button1);
  int state2 = digitalRead(button2);
  int state3 = digitalRead(button3);


  if (state1 == HIGH || state2 == HIGH || state3 == HIGH) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
}