57. Arduino UART Programming

Which of the following statements are true regarding LED connected to pin 13? (every Arduino uno board has an onboard LED connected to its pin 13).

void setup() {
  Serial.begin(9600);
  Serial.setTimeout(9000);

  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);

  Serial.println("Hello EW skills!");
  delay(10);
}


void loop() {

  if (Serial.available() > 0) {
    String str = Serial.readString();
  }

  digitalWrite(13, HIGH);
  while (1) ;
}