To answer this question, you need to understand different delimiting methods used for string interpolation.
Option A) Delimited by single quote - This option is incorrect because string interpolation is not typically done using single quotes. Single quotes are commonly used to delimit string literals in programming languages, but they do not support string interpolation.
Option B) Delimited by double quote - This option is incorrect because while double quotes can be used to delimit string literals and support some form of string interpolation in some programming languages, it is not the specific delimiting method known as string interpolation.
Option C) Delimited by <<< identifier - This option is correct because the <<< identifier (also known as heredoc syntax) is a specific delimiting method used for string interpolation in some programming languages. It allows multiline strings with variable interpolation.
Option D) All of the above - This option is incorrect because not all of the above options are correct. Only option C is the correct delimiting method known as string interpolation.
Therefore, the correct answer is C) delimited by <<< identifier. This option is correct because it represents the specific delimiting method known as string interpolation.