Which two statements are correct about the BGP MED attribute? (Choose two.)

Which two statements are correct about the BGP MED attribute? (Choose two.)
A . BGP uses the MED value when peering to two or more connections to the same upstream AS
B . BGP routes require the MED attribute be defined
C . BGP uses the MED value when peering to two different upstream ASs
D . BGP assumes the MED value to be 0, if not already defined

Answer: AD

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/med-attribute.html