Which of the following are pre-requisites for enabling cross region replication between S3 buckets. Choose 2 answers from the options given below

Answer options:

A.The source and destination buckets must have versioning enabled
B.The source and destination buckets must have MFA enabled
C.The source and destination buckets must be in different AWS Regions
D.The source and destination buckets must be in different AWS AZ’s

Answer – A and C
The AWS documentation mentions the following
Requirements for cross-region replication:
1)The source and destination buckets must have versioning enabled. 
2)The source and destination buckets must be in different AWS Regions.
For more information on cross region replication please see the below link:
http://docs.aws.amazon.com/AmazonS3/latest/dev/crr.html