Understanding the Requirement:

The field data from a third-party system needs to be transformed into one of three possible choices.

This transformation implies conditional logic, where the output depends on the value of the input field.

Why Option A ("Switch") is Correct:

TheSwitchfunction evaluates a given input against multiple cases and outputs a corresponding value based on the matched condition.

For example:

switch(field, "value1", "choice1", "value2", "choice2", "defaultChoice")

If field equals "value1", the output is "choice1".

If field equals "value2", the output is "choice2".

If no conditions match, the output is "defaultChoice".

This functionality perfectly fits the requirement to transform the input into one of three possible choices.

Why the Other Options are Incorrect:

Option B ("Slice"):

The slice function is used for extracting a portion of a string or array but does not support conditional transformations.

Option C ("Split"):

The split function divides a string into an array based on a specified delimiter. It is not designed for conditional logic or value mapping.

How This Solves the Problem:

The Switch function allows flexible and dynamic transformations, ensuring the field data is mapped to the correct choice based on its value.

References and Supporting Documentation:

Adobe Workfront Fusion Functions Documentation

Workfront Community: Using the Switch Function for Conditional Logic