Consider the following PHP classes:

Consider the following PHP classes:

class Vehicle {
  function start() {
    echo "Starting vehicle";
  }
}
class Car extends Vehicle {
  function start() {
    echo "Starting car";
  }
}
class ElectricCar extends Car {
  function start() {
    parent::start();
    echo " silently";
  }
}

What will be the output of:

$ec = new ElectricCar();
$ec->start();