Challenge 1 / 1

Check out this class:

class Animal {
    public $species = "Lion";

    public function getSpecies()
    {
         return $this->species;
    }
}

How could we improve getSpecies() to allow it to return an uppercase version of the species?

public function getSpecies($uppercase)
{
    if ($uppercase) {
        return strtoupper($this->species);
    }

    return $this->species;
}

public function getSpecies($uppercase)
{
    if ($uppercase) {
        return strtoupper($this->$species);
    }

    return $this->$species;
}

public function getSpecies($uppercase)
{
    if ($uppercase) {
        return strtoupper($species);
    }

    return $species;
}

public function getSpecies($uppercase = 'false')
{
    if ($uppercase == 'true') {
        return strtoupper($species);
    }

    return $species;
}