Which two public methods must be implemented in a functional custom shipping method directly extending
Mage_Shipping_Model_Carrier_Abstract and also implementing Mage_Shipping_Model_Carrier_Interface?
(Choose two)

A.
collectRates()

B.
getAllowedMethods()

C.
isTrackingAvailable()

D.
isFixed()

E.
getConfigData()

F.
checkAvailableShipCountries()