What does the "h" in front of a string literal such as h`my string` mean?

Answer options:

A.The string is considered hot path data.
B.The string is a hyperlink.
C.The string is obfuscated.
D.Nothing - this character is always ignored.

Correct Answer: C Option C is correct. An obfuscated string literal can be formed by taking a "regular" string literal, and prepending an h or an H character in front of it.
Option A, B and D are incorrect as h is used for obfuscation purposes only.
Reference: 

https://docs.microsoft.com/en-us/azure/data-explorer/kusto/query/scalar-data-types/string