When using string conditions within IAM, short versions of the available comparators can be used
instead of the more verbose ones.
streqi is the short version of the _____ string condition.

A.
StringEqualsIgnoreCase

B.
StringNotEqualsIgnoreCase

C.
StringLikeStringEquals

D.
StringNotEquals

Explanation:
When using string conditions within IAM, short versions of the available comparators can be used
instead of the more verbose versions. For instance, streqi is the short version of
StringEqualsIgnoreCase that checks for the exact match between two strings ignoring their case.
http://awsdocs.s3.amazonaws.com/SNS/20100331/sns-gsg-2010-03-31.pdf