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.
-One section of the new application requires Sydney to add 2 years and 6 months to the current date. Which of the following expressions do you tell him will provide the correct result?

A) current-date() + xs:yearMonthDuration('p2y6m')
B) current-date() + xs:yearMonthDuration('PY2M6')
C) current-date() + xs:yearMonthDuration('P2Y6M')
D) current-date() + xs:yearMonthDuration('py2m6')