Sydney Is Building an Application with XSLT 2

Multiple Choice

Sydney is building an application with XSLT 2.0 that relies on many date formats and calculations. He comes to you for some assistance in developing these formats and calculations correctly.
-Sydney has been adding several more date calculations to the application, but has encountered an error. He has been trying to store values for changes in dates and times, but the values displaying in the result document are not at all what he expected them to be. In looking over his code, you remind him that he must use the _____ data type to store changes in dates and times.

A) xs:duration
B) xs:dateTime
C) xs:timeChange
D) xs:time