To answer this question, we need to understand the concept of ps.xml in the context of applications.
In general, ps.xml is a configuration file used in some applications to define settings or parameters. The question asks how many ps.xml files can be defined for one application.
The correct answer is B) 1.
This means that typically, only one ps.xml file can be defined for a single application. Multiple ps.xml files for the same application are not typically used or supported. Each application usually has one specific ps.xml file that contains the necessary configuration settings for that application.