A sys admin has enabled logging on ELB. Which of the below mentioned fields will not be a part of the log file name?

A.
Load Balancer IP

B.
EC2 instance IP

C.
S3 bucket name

D.
Random string

Explanation:
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/access-log-collection.html#access-log-file-format
The file names of the access logs use the following format:
bucket[/prefix]/AWSLogs/aws-account-id/elasticloadbalancing/region/yyyy/mm/dd/aws-accountid_elasticloadbalancing_region_load-balancer-name_end-time_ip-address_random-string.log
IP address: the IP address of the load balancer node that handled the request. For an internal load balancer, this is a
private IP address.