Absolute Free SPLK-2003 Exam Practice for Comprehensive Preparation 

The parent can pass arguments to the child when called, and the child can return values from the end block. 

The parent can pass arguments to the child when called, but the child can only pass values back as new artifacts in the event.

The parent must create a new artifact in the event named arg_xxx, and the child must return values by creating artifacts with the naming convention return_xxx

The parent must create a new artifact in the event named return_xxx, and the child must return values by creating artifacts with the naming convention arg_xxx.