Select which question type is NOT compatible with 2-way SMS Distribution.

The question type that is not compatible with 2-way SMS Distribution is Rank Order. This is because Rank Order questions require respondents to arrange items in a specific order based on importance or preference. Such functionality involves a level of complexity that is difficult to execute through SMS, which is typically designed for more straightforward, concise interactions.

In contrast, the other question types, such as Multiple Choice, Text Entry, and Matrix Questions, are generally more compatible with SMS as they allow for simpler and quicker responses that fit within the character limits and practical usage of text messaging. Multiple Choice presents clear options for selection, Text Entry allows for straightforward response inputs, and Matrix Questions can be designed in a way that prompts for specific, directed responses even within the constraints of a text message format.

Thus, Rank Order stands out as the least suitable for 2-way SMS Distribution due to its inherent requirements for ordering and comparative evaluation, which cannot be efficiently or effectively addressed through SMS.