Which of the Following Lines Includes a Payment Method Object

Multiple Choice

Which of the following lines includes a payment method object?

A) $quote->getShippingAddress ( ) ->setPaymentMethod(isset ($data['method']) ? $data['method'] : null) ; inside Mage_Checkout_Model_Type_Onepage
B) public function setPayment(Mage_Sales_Model_Quote_Payment $payment) inside Mage_Sales_Model_Quote
C) $method = $this->getMethodInstance ( ) ; inside Mage_Sales_Model_Quote_Payment
D) $instance->setInfoInstance($this) ; inside Mage_Payment_Model_Info