To create a work object from an activity, you need to perform the following steps:
Option A) Create a step page of the class of the work object - This option is correct because when you create a step page of the class of the work object, you can access and manipulate the properties of the work object within the activity.
Option B) Call the Add activity - This option is correct because calling the Add activity allows you to create a new work object of a specific class.
Option C) Enter the name of a starting harness - This option is incorrect because entering the name of a starting harness is not the correct way to create a work object from an activity.
Option D) All of the above - This option is correct because both Option A (create a step page) and Option B (call the Add activity) are correct steps to create a work object from an activity.
Option E) None of the above; activities cannot create work objects - This option is incorrect because activities can create work objects.
Therefore, the correct answer is Option D.