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.
checkAvailablesnipCountries ( )