Let's analyze the provided Arduino code:

Code:

void setup() {
  Serial.begin(9600);
}

void setup() {
  Serial.write(20);
}

Explanation:

1. Serial.begin(9600);:

   • This initializes serial communication at a baud rate of 9600 bits per second. It prepares the Arduino to send and receive data over the serial connection.

2. Serial.write(20);:

   • Serial.write() sends data as bytes over the serial connection. It takes a single byte as an argument and sends it.
   • The argument 20 is a decimal value, which is equivalent to 0x14 in hexadecimal and 24 in binary.
   • The write() function sends this byte (value 20) to the serial port.

Outcome:

• The code will send a byte with the value 20 (in decimal) through the serial connection.
  • This is not a string or number in octal/hexadecimal format, but the actual byte value 20.

Correct Answer:

(C) Send a byte with value 20 through the Serial pins.