2. The following code does not compile. Find the error and describe the rule that is being broken. uint16_t add (uint16_t a, uint16_t b, uint16_t c) a a += b; += c; uint16_t average = a/3; return a; void setup() { // put your setup code here, to run once: Serial.begin(9600); void loop() { // put your main code here, to run repeatedly: uint16_t sum = add(4, 6, 8); Serial.print("The sum is: "); Serial.println (sum); Serial.print("The average is: "); Serial.println(average)